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From a pre-industrial-revolution level of 280 parts per million in the atmosphere, carbon dioxide (CO2) has now risen to 400 parts per million. CO2, as the main greenhouse gas emitted by burning fossil fuels, traps infrared radiation, warms the planet, and melts glaciers and ice sheets. People around the world are struggling to cope with rising seas, floods, heat waves, droughts, massive cyclones, tornadoes, and other forms of unstable weather.