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Prepare for global temperature rise of 4C, warns top scientist

Agent 204
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Agent 204
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quote:The UK should take active steps to prepare for dangerous climate change of perhaps 4C according to one of the government's chief scientific advisers.

In policy areas such as flood protection, agriculture and coastal erosion Professor Bob Watson said the country should plan for the effects of a 4C global average rise on pre-industrial levels. The EU is committed to limiting emissions globally so that temperatures do not rise more than 2C.

"There is no doubt that we should aim to limit changes in the global mean surface temperature to 2C above pre-industrial," Watson, the chief scientific adviser to the Department for the Environment, Food and Rural Affairs, told the Guardian. "But given this is an ambitious target, and we don't know in detail how to limit greenhouse gas emissions to realise a 2 degree target, we should be prepared to adapt to 4C."


Source.

M. Spector
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George Monbiot has already lamented that we have given up on a 2°C increase in global temperatures. It's no surprise then that experts are now telling us to brace for 4°. How long will it be before we're told to prepare for 6°?

From the Guardian article in the OP:

quote:Globally, a 4C temperature rise would have a catastrophic impact....

"My own feeling is that if we get to a 4 degree rise it is quite possible that we would begin to see a runaway increase," said King....

"At 4 degrees we are basically into a different climate regime," said Prof Neil Adger, an expert on adaptation to climate change at the Tyndall Centre for Climate Change Research in Norwich.

"I think that is a dangerous mindset to be in. Thinking through the implications of 4 degrees of warming shows that the impacts are so significant that the only real adaptation strategy is to avoid that at all cost because of the pain and suffering that is going to cost.

"There is no science on how we are going to adapt to 4 degrees warming. It is actually pretty alarming," he added.


Frustrated Mess
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quote: George Monbiot has already lamented that we have given up on a 2°C increase in global temperatures. It's no surprise then that experts are now telling us to brace for 4°. How long will it be before we're told to prepare for 6°?

The political and social elites have already determined they would prefer to risk a global catastrophe if it means the possibility of exploiting riches currently under frozen seas.

The average citizen is quite happy to continue the party unabated and leave the mess, no matter the consequences, to their children.

It is why even on progressive sites the majority of the discussions are not about what me must give up for a sustainable world, but how do we continue on without giving up anything at all.


Policywonk
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The risk is that even a two degree increase may result in positive feedback mechanisms (such as the rapid release of carbon dioxide and methane from melting permafrost (already occurring to some extent) and sudden release from methane clathrates), to the extent that a 2 degree increase results in a 4 degree change results in a 6 degree change over a relatively short period of time. For an idea of what that might look like:

Six Degrees

The general idea is to mitigate what can't be adapted to and adapt to what can't be mitigated.
According to a number of studies, the chances of a 2 degree rise in temperature are not negligible even if we were to stop emitting greenhouse gases now, and a two degree rise is likely to be exceeded with a doubling of carbon dioxide concentrations. The worst-case scenario appears to be along the lines of the Permian-Triassic extinction. Something to be avoided.

[ 07 August 2008: Message edited by: Policywonk ]


M. Spector
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Quote:
By the time global temperatures reach four degrees, much of humanity will be short of water for drinking and irrigation: glaciers in the Andes and Himalayas, which feed river systems on which tens of millions depend, will have melted, and their rivers will be seasonally running dry. Whole weather systems like the Asian monsoon (which supports 2 billion people) may alter irrevocably. Deserts will have spread into Mediterranean Europe, across most of southern Africa and the western half of the United States. Higher northern latitudes will be plagued with regular flooding. Heatwaves of unimaginable ferocity will sear continental landscapes: the UK would face the kind of summer temperatures found in northern Morocco today. The planet would be in the throes of a mass extinction of natural life approaching in magnitude that at the end of the Cretaceous period, 65m years ago, when more than half of global biodiversity was wiped out.

Four degrees of warming would also cross many of the "tipping points" which so concern climate scientists: the Amazon rainforest would likely collapse and burn, as part of a massive further release of carbon from terrestrial ecosystems – the reverse of the current situation, where trees and soils absorb and store a good portion of our annual emissions. Most of the Arctic permafrost will lie in the melt zone, and will be steadily releasing methane, accelerating warming still further. The northern polar ice cap will be a distant memory, and Greenland will be melting so rapidly that sea level rise by the end of the century will be measured in metres rather than centimetres.

Source


MYTHBUSTER
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This is nothing but Scaremongering!!

Al Gore's allegation that there is a "consensus" among scientists that CO2 has caused the current warming

Is that Right?

Dr. Don J. Easterbrook, Professor Emeritus Geology, Western Washington University is the author of 8 books, 150 journal publications with a focus on geomorphology; glacial geology; Pleistocene geochronology; environmental and engineering geology Has to say This:

“there is no consensus” -- no one has polled the world’s several hundred thousand scientists. Gore (2006) claimed that of 928 articles dealing with climate change in the past 10 years, none expressed any doubt about the cause of global warming. Lindzen (2006), however, found that of those 928 publications, only 13 favored CO2 as the cause of global warming.

13 of 928 and thats concensus? Thats 2% folks.

Thats the opinoion of an expert, not a person eductated in economics as I am. Don't believe the people that are scaring you that its all our fault, fact is no-one knows.


MYTHBUSTER
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addition to above by professor Dr. Don J. Easterbrook;

The warming over the past 50 years is hardly even noticeable on the 15,000 year graph. Compare the peaks about every 800-1000 years for the past 10,000 years (since the last full ice age), all are much warmer than what we're experiencing now. In fact the last 1,000 years has been unusually cool for this interglacial period, just looking at the graph it certainly looks like we've been over due for warming (or if our interglacial period is over another full ice age which would be much worse).


kropotkin1951
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Links links links.

Either provide links to this so we can assess their validity for our selves or maybe give up.

I don't care about Al Gore and his self promotion. You still will not respond to Canadian figures like Watt Cloutier. Just tells me all you've got on this issue is the same line.

So what about cancer. I suppose cigarette smoking has also still not been proven to be a cause of cancer because there is never a direct correlation that can be absolutely pointed too.


Trevormkidd
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This at least the second thread that MB has decided to spread his lies. In the first one - now closed - this poster appeared just after a Global Warming denial episode of Penn & Teller's Bullshit! and was really just using P&T denial baloney and passing it off as facts and "research." Hence his use of the weather network founder, volcanoes, hatred of Al Gore etc. It was basically a replay of the episode. In the case of the former he couldn't even be bothered to look up the guy's name (John Coleman) and he is not skeptical enough to wonder why it is that the P&T denialist baloney has so little support that they couldn't find a single scientist to support their views - not a one, so they were left with wackjobs like Coleman who has never published anything on climate change, is not a scientist and showed a completely inaccurate graph unchallenged. It should be pointed out that the episode and P&T's unsupported beliefs were even severely criticized for its ridiculousness by the likes of Libertarian Ronald Bailey who in the past wrote two books calling global warming a scam. I could go on and on, but every "point" that MB has brought up in either thread has been demolished on babble before. Nor should posters have to deal with this kind of idiocy repeatedly. There are plenty of sites on the net for the likes of MB to congregate and spew their lies. There are plenty of things regarding climate change that should be debated on babble. Any legitimate scientific research that is critical of the theory, political policy and so on. However, it is pointless to continually rehash long debunked lies. Posters should ignore the likes of MB as he will continue to ignore anything that doesn't fit with his conspiracy theory, so there is little sense even correcting him.

Yes, we get it MB, you think that the 0.1% of scientists who are deniers and in relevant fields to climate change are the only ones who should be listened to and you believe anything they say without question. Congratulations you are superior.

Previously, Michelle has got rid of these morons, as this is not a site for the promotion of far right-wing conspiracy theories. MB has contributed nothing to this site except his denier propaganda.

[ 12 August 2008: Message edited by: Trevormkidd ]

[ 12 August 2008: Message edited by: Trevormkidd ]


Jerry West
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quote:Originally posted by MYTHBUSTER:

The warming over the past 50 years is hardly even noticeable on the 15,000 year graph.

The warming over the past 200 years is certainly noticeable on the 8000 year graph.

How about some links to Easterbrook's data and graphs? And why a 15,000 year comparison?

You might want to comment on this:

Article with graphs


Policywonk
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I think I'll go with the Hadley centre prediction. We'll know soon enough if it is optimistic, pessimistic, or bang on.

Hadley Centre Prediction

I would be willing to bet that barring a few major volcanic eruptions, the decade 2011-2020 will be warmer than the current decade by a statistically significant amount, and that the Arctic ice cap will disappear in that time period.


grumpydigger
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our great professor DR Suzuki in the !970 was traveling around and talking about how we were going into the next ice age.......... there is big money to be made by spreading fear in the people...........I just wonder what is next.....

Policywonk
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quote: our great professor DR Suzuki in the !970 was traveling around and talking about how we were going into the next ice age.

Link?

This page refutes all of the arguments of the denialists, skeptics, and self-described agnostics
How to talk to a skeptic, including the idea the scientific view in the 70s was that we were on the verge of another glacial period.

The trouble is, they don't listen.


grumpydigger
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Link HA HA I was there in the 70s and heard him..... All those links disappeared long ago because the econazis dont want the people to know what they were talking about back then ... And how damm wrong they were back then..............

Trevormkidd
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quote:Originally posted by grumpydigger:
Link HA HA I was there in the 70s and heard him.....

Righto. If Suzuki said that in the 70s the deniers would be reminding people of it daily. Either provide a link or some evidence or if you come up with none then please retract your statement.

[ 13 August 2008: Message edited by: Trevormkidd ]


grumpydigger
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finding a link for something said 40 years ago ha ha know matter what is posted the econazis will have a answer for it.... the fact is he said it




David MacRae is a software consultant who works out of his home in St. Laurent, Quebec.

THE CONTRARIAN

GLOBAL WARMING
AND DAVID SUZUKI'S LIES

by David MacRae


When I was growing up in the 60s and 70s, one of the highlights of my TV-viewing week was David Suzuki's excellent The Nature of Things. Each week I looked forward to yet another lucid insight into the workings of technology and the natural world. As a consequence of that long-running series, Suzuki is by far the best-known scientist in Canada. In fact, he has a considerable reputation worldwide.

Half-truths man

It's sad to see how a man I once admired has recently stooped to obfuscation, half-truths and outright lies in support of the Luddite cause of stopping technological progress. He imagines that we should return to some mythical past in which Mankind lived in harmony with nature.

Of course, Man has never lived in harmony with nature. Instead he has fought it from the beginning, and rightly so. Until the capitalist revolution of the last 250 years gave us some control over Nature's depredations, the vast majority of people lived lives that were brutish, backbreaking and short. The « rich » were those who had a full belly with an occasional helping of meat.

In their mad dash back to this imaginary garden, Suzuki and the other eco-nuts have always set their sights first and foremost on the energy industry. This is because energy is the foundation of a modern of economy. Destroy that and mankind will truly return to the past. In their lemming rush, they ignore one small detail: if they ever achieved their goals, billions of people would die. In their death throes, they would unleash an ecological catastrophe that would dwarf the extinction of the dinosaurs.

Twenty-five years ago, the eco-nuts were fussing about how another ice age was coming. Remember that? Today it's the opposite problem; the ice caps are about to melt and we're all going to be drowned. Conveniently, the cause of this coming disaster is the energy industry. To support this idea Suzuki and the rest of the eco-nut fringe present us with the following « reasoning »:

1) The earth is warming up;
2) Man-made emissions of greenhouse gases, especially carbon dioxide, are the cause;
3) This global warming will have a disastrous effect on the future of Mankind and the planet on the whole;
4) The Kyoto Protocol, forcing developed nations to cut back on carbon emissions, will save us from this disaster.

All four of these claims are false. Let's take them in turn:

* Claim: The earth is warming.
* Fact: The global temperature reached its modern peak about 1940 and declined somewhat in the following decade. It has not changed significantly in the last fifty years although there has been considerable variation from year to year, largely due to the El Niсo phenomenon.

* Claim: The cause of warming is man-made increases in atmospheric CO2.
* Fact: The cause of global temperature change is – wait for this – changes in the amount of radiation emitted by the sun. Should this surprise anyone? It is intuitively obvious and was first verified scientifically more than a hundred years ago.

* Claim: This warming will cause global disaster.
* Fact: A somewhat higher global temperature would be beneficial. Since the end of the last Ice Age, the global temperature has usually been higher than it is today. A long high plateau occurred between 8000 BC and 4000 BC. This period is called the Neolithic Climatic Optimum, not the Neolithic Climatic Disaster. Another shorter rise around 1000 AD has a similar name: the Medieval Climatic Optimum. Global temperatures were at a minimum between 1300 AD and 1650 AD. This period is called the Little Ice Age. To put it simply: Heat good. Cold bad. Can any Canadian really doubt this?

* Claim: Kyoto will save us all.
* Fact: Even if fully implemented, Kyoto will have a minimal effect on atmospheric accumulations of carbon dioxide. According to the exact same climate models which supposedly prove that the earth is heating up due to CO2 emissions are the cause, Kyoto would not change things by more than 0.1єC over the next century, an insignificant amount.

I am not going to justify these statements. If you want to look further into it, Junkscience.com has some good links. I especially recommend John Daly's Still Waiting for the Greenhouse and Arthur B. Robinson's Oregon Petition Project. Instead I want to concentrate on Suzuki part in this scam.

Since his thesis contradicts known facts in every way, he necessarily resorts to lies, blustering and misdirection in order to support his position. This is typical of any fanatic.

The Canoe Session

Let's watch his mendacity and obfuscation in action. On September 21st, canoe.ca sponsored him in an Internet Chat Session on this subject. From the transcript, I've extracted all the exchanges he made with his debunkers, people who disagree with his precepts. The rest were supporters or people who were simply looking for information.

We'll start with a simple request for information before we go on to people who actually confront his lies.

Richard Weatherill: Is it fairly conclusive that human activity is the primary cause of climate change, or can it be attributed equally as well to some cyclic phenomena, of which we are only dimly aware, if at all? Thank you.

David Suzuki: It's possible of course that there are things we don't even know about but the overwhelming consensus of climatologists is that we are a major cause of a warming that is not a natural cycle.

This claim is simply a lie. The overwhelming consensus of climatologists is that, if warming exists at all, its causes are natural. In all polls of climatologists conducted so far, those who expressed an opinion were far more likely to disagree with the Greenhouse theory than to accept it. For example, a 1997 Gallup poll indicated that 83 per cent of North American climatologists disagree with it.

Alan Caruba: Is it not true that the earth's overall temperature has not increased in at least the past fifty years? That no satellite or radiosonde balloon data has found a rise in temperature since around 1950 or so?

David Suzuki: The data that have been gathered, including recalibrated satellite info, support a 1є rise in the last century.

Notice that he did not answer the question. Everyone agrees that temperatures have risen over the last century. In fact, they have risen steadily over a three hundred year period starting about 1650. As I noted, the modern peak in 1940 and temperatures have been stable since 1950. Yes, temperatures rose in the first half of the twentieth century. The question was about the second half.


« As the years go by, there is a stronger and stronger consensus among climatologists that global warming does not exist. There is virtual unanimity that if warming is taking place, the causes are natural. »


pogge
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Maybe it's just me, but an eight year old article in which a software consultant argues with portions of a transcript of an interview with a geneticist doesn't strike me as saying anything definitive about climate science (especially when the same author links approvingly to the Oregon Petition which has been debunked so many times it qualifies for zombie status -- people keep killing it but it won't die).

Edited to add:

And by the way, since you're the one who brought up Suzuki in the first place, knocking him down amounts to beating up on a straw man.

[ 13 August 2008: Message edited by: pogge ]


Trevormkidd
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quote:Originally posted by grumpydigger:
finding a link for something said 40 years ago ha ha know matter what is posted the econazis will have a answer for it.... the fact is he said it

You have offered no evidence of such. Please retract the statement. Deniers manage to find and repeat such things over and over again. If Suzuki had said such a thing then Deniers would be repeating his remarks daily. They have found no remarks from Suzuki. Retract your lie please.

This is also the second time that you have called those who are in agreement with 99.8% of the scientists in fields related to climate change - econazis. Is that allowed on babble?

quote:David MacRae is a software consultant who works out of his home in St. Laurent, Quebec.

Ah, a scientific expert I see.

quote:It's sad to see how a man I once admired has recently stooped to obfuscation, half-truths and outright lies in support of the Luddite cause of stopping technological progress.

One method of dealing with climate change may be to stop technological progress. A far more likely route is actually to increase the speed of technological progress. Doing real good so far MacRae.

quote:.......Of course, Man has never lived in harmony with nature.......

This is completely irrelevant, we are discussing the science of climate change - something MacRae gets completely wrong.

quote:Twenty-five years ago, the eco-nuts were fussing about how another ice age was coming. Remember that?

25 years ago there was almost no scientific support for a looming ice age. Even at that time there was far more scientific support in favor of warming due to increases in ghgs. Read the scientific journals. In the 70s you will find almost no mention of a looming ice age in scientific journals - and most of those mentions are critical of the idea, while there are already far more mentions of global warming in those scientific journals.

quote:Today it's the opposite problem; the ice caps are about to melt and we're all going to be drowned. Conveniently, the cause of this coming disaster is the energy industry.

Whether the cause is convenient or not is irrelevent, it is still the cause - well understood by the scientific community and any lay person who understands basic science and has taken the small amount of time required to understand the issue.

quote:All four of these claims are false. Let's take them in turn:

* Claim: The earth is warming.
* Fact: The global temperature reached its modern peak about 1940 and declined somewhat in the following decade.

This is beyond false. Not even the likes of Lindzen, Spencer and Christy would make such a bogus claim.

quote: It has not changed significantly in the last fifty years although there has been considerable variation from year to year, largely due to the El Niсo phenomenon.

Complete bullshit.

quote: * Claim: The cause of warming is man-made increases in atmospheric CO2.
* Fact: The cause of global temperature change is – wait for this – changes in the amount of radiation emitted by the sun. Should this surprise anyone? It is intuitively obvious and was first verified scientifically more than a hundred years ago.

Complete bullshit. The relationship of solar radiation/intensity and temperature has a strong link going back a couple hundred years and up until the mid- to late 1970s. This has been well established by Dr Sami Solanki whose work has often been used incorrectly by deniers and indeed who has been listed as a denier by many including Soloman in his NP articles and his book called Deniers. Of course none of them bother to say that Solanki hasn't shown that the Sun is responsible for the warming - which is what he set out to prove - but in fact the opposite as Solanki himself makes clear stating that the temperature has increased rapidly in the last 30 years while solar radiation/intensity has not increased.

I don't think that there is any point going farther.

Please do not spread these lies on babble.

[ 13 August 2008: Message edited by: Trevormkidd ]


M. Spector
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quote:Originally posted by Trevormkidd:
This is also the second time that you have called those who are in agreement with 99.8% of the scientists in fields related to climate change - econazis. Is that allowed on babble?
It is, as long as there are no mods around.

Frustrated Mess
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quote: Of course, Man has never lived in harmony with nature.......

This is completely irrelevant


I don't know if it is irrelevant, but it is an astoundingly stupid thing to say as we are products of nature. For all we know we are fulfilling our natural function by bringing about ecological changes that will be catastrophic for us but will be barely a blip in the life of the planet.

M. Spector
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Quote:
We need to get prepared for four degrees of global warming, Bob Watson told the Guardian last week. At first sight this looks like wise counsel from the climate science adviser to Defra. But the idea that we could adapt to a 4°C rise is absurd and dangerous. Global warming on this scale would be a catastrophe that would mean, in the immortal words that Chief Seattle probably never spoke, “the end of living and the beginning of survival” for humankind. Or perhaps the beginning of our extinction.

The collapse of the polar ice caps would become inevitable, bringing long-term sea level rises of 70-80 metres. All the world’s coastal plains would be lost, complete with ports, cities, transport and industrial infrastructure, and much of the world’s most productive farmland. The world’s geography would be transformed much as it was at the end of the last ice age, when sea levels rose by about 120 metres to create the Channel, the North Sea and Cardigan Bay out of dry land. Weather would become extreme and unpredictable, with more frequent and severe droughts, floods and hurricanes. The Earth’s carrying capacity would be hugely reduced. Billions would undoubtedly die.

On a planet 4°C hotter, all we can prepare for is extinction


Agent 204
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The title of that article is a bit misleading, given that the article itself says "perhaps" the beginning of our extinction. It does, however, go on to say, correctly in my opinion, that "billions would undoubtedly die". I'd compare it to being on a ship that's being driven recklessly by a drunken crew through iceberg-ridden waters, with enough lifeboats for, at most, half the people on board. You can't disable the engines, or the ship will eventually drift into an iceberg; you have to overpower the crew, by any means necessary, and take control of the vessel. But at the same time, you should be thinking about how to get as many people as possible into the lifeboats as possible.

I think the reason why Tickell thinks it's dangerous to make contingency plans for a 4 °C is that giving yourself a chance to make it through the catastrophe might take away some of the sense of urgency to prevent things from going that far. I don't think this is the case. I suppose it's possible, just like I suppose it's possible that people who wear seat belts or helmets are more likely to crash their vehicles.


M. Spector
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Now an even newer study from the Tyndall Centre has more bad news:
4° temperature rise "almost certain"

Quote:
It is "improbable" global warming will be kept below 4C - double the rise considered safe to avoid climate catastrophe - according to an influential new report.

Internationally, it has long been agreed governments should be aiming to keep a global temperature rise below 2C, to avoid climate change spiralling out of control.

However, a bleak new study by scientists at the Tyndall Centre, a leading organisation for climate change research at the University of Manchester, now suggests we should be adjusting our expectations towards far higher rises.

It warns carbon dioxide in the atmosphere will almost certainly stabilise at levels of at least 650 parts per million (ppm), which is roughly equivalent to a four-degree temperature increase.

The authors write: "Given the reluctance, at virtually all levels, to openly engage with the unprecedented scale of both current emissions and their associated growth rates, even an optimistic interpretation of the current framing of climate change implies that stabilisation much below 650ppm is improbable."

 


Transplant
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This is why you should be [strikeout]concerned about[/strikeout] terrified of an ice-free Arctic:

The methane time bomb

The Independent - Arctic scientists discover new global warming threat as melting permafrost releases millions of tons of a gas 20 times more damaging than carbon dioxide

quote:Underground stores of methane are important because scientists believe their sudden release has in the past been responsible for rapid increases in global temperatures, dramatic changes to the climate, and even the mass extinction of species. Scientists aboard a research ship that has sailed the entire length of Russia's northern coast have discovered intense concentrations of methane – sometimes at up to 100 times background levels – over several areas covering thousands of square miles of the Siberian continental shelf.

In the past few days, the researchers have seen areas of sea foaming with gas bubbling up through "methane chimneys" rising from the sea floor. They believe that the sub-sea layer of permafrost, which has acted like a "lid" to prevent the gas from escaping, has melted away to allow methane to rise from underground deposits formed before the last ice age. ...


Policywonk
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The article understates the problem; due to the relatively short lifetime of methane in the atmosphere the global warming potential of methane depends on how quickly it is released. The usual figure of 20 or so is averaged over 100 years, while the GWP averaged over 20 years is over 70.

On the other hand, the MSM covered this story in the past few days: Discovery waters down fears of fast-melting ice.

I think the threat from methane clathrates is more serious than that of melting permafrost on land even if localized wedges of ice do survive warming periods, especially if some idiots try to disturb the clathrates by trying to exploit them for energy.


Transplant
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quote:Originally posted by Policywonk:
due to the relatively short lifetime of methane in the atmosphere


Don't forget that in the atmosphere methane oxidises to form CO2 and H2O, so even it's decay products are greenhouse gases, making it the global warming "gift" that keeps on giving.


Policywonk
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quote: Don't forget that in the atmosphere methane oxidises to form CO2 and H2O, so even it's decay products are greenhouse gases, making it the global warming "gift" that keeps on giving.

Actually, oxidizing (or burning) methane is a good thing relative to releasing it into the atmosphere because the global warming potential of carbon dioxide is much less than methane and the atmospheric lifetime of water vapour is much less than that of methane.


Transplant
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quote:Originally posted by Policywonk:
Actually, oxidizing (or burning) methane is a good thing relative to releasing it into the atmosphere because the global warming potential of carbon dioxide is much less than methane and the atmospheric lifetime of water vapour is much less than that of methane.

Ah, but the residence time of CO2 (more than a hundred years, and growing) is an order of magnitude greater than for CH4 (ten+ years). The residence time of H2O is mere days, but as the atmosphere warms, it will hold more water vapour.


Policywonk
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quote: Ah, but the residence time of CO2 (more than a hundred years, and growing) is an order of magnitude greater than for CH4 (ten+ years). The residence time of H2O is mere days, but as the atmosphere warms, it will hold more water vapour.

The GWP of methane is rather more than an order of magnitude greater than carbon dioxide averaged over the residence time of methane.

A warmer atmosphere will hold more water vapour regardless of whether it comes from combustion or evaporation (which dwarfs combustion by several orders of magnitude).


Transplant
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quote:Originally posted by Policywonk:
The GWP of methane is rather more than an order of magnitude greater than carbon dioxide averaged over the residence time of methane.

Quite true, but my point is you get both from methane emissions, since when the methane oxidises (not the same as combustion) it turns into CO2.

quote:A warmer atmosphere will hold more water vapour regardless of whether it comes from combustion or evaporation

Also true.


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