When Obama arrives in Copenhagen tomorrow to support Chicago's 2016 Olympic bid, he will be showing the world that he is willing to schlep to Scandinavia for an event he considers important. The big question now is: will he do it again on December 7, when Copenhagen plays host to the United Nations summit on climate change, the highest-stakes environmental negotiations in history?

London, England -- I am at the cavernous Excel Centre in the outskirts of Canary Wharf with a press corps of thousands (but only 28 from Canada) who, like me, have gone through an inscrutable two-bus switch and security process to get here April 2.

But for hours, a small spate of press conferences and a few carefully managed photo ops are really all there is to feed actual news appetites. So we're all munching on free sandwiches and pounding out stories and broadcasts about... well, mainly we're guessing what the story will be once the final G20 communiqué's out.

President Barack Obama met recently with the prime ministers of Canada and Britain. This week's meeting with Britain's Gordon Brown, who was pitching a "global New Deal," created a minor flap when the White House downsized a full news conference to an Oval Office question-and-answer session, viewed by some in Britain as a snub. The change was attributed to the weather, with the Rose Garden covered with snow.

It might have actually related not to snow cover, but to a snow job, covering up the growing divide between Afghanistan policies.