Earth_system2 - Earth System 2 Long-Term Climate Change...

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9/12/2013 1 Earth System 2 When one tugs at a single thing in nature, he finds it attached to the rest of the world. ~John Muir Long-Term Climate Change Global climate history largely deciphered – Greenhouse – Warmer climates – Icehouse – Colder climates Ice ages Last 65 million years – Warm climate at the end of the dinosaur’s reign – Climate cooling since Oligocene External Factors Climate Forcings • CO 2 and CH 4 are among the greenhouse gases – Transparent to incoming UV radiation – Absorb infrared energy re-emitted from Earth’s surface strong control on climate – Processes that add or remove GHGs regulate climate Greenhouse gases GHG and the Greenhouse Effect There is no debate over the validity of the greenhouse effect. The question is to what degree climate fluctuations of were either caused by or the result of GHG variations. Human effect Humans dominate the planetary ecosystem head2right Massive land use transformation – urban, agriculture, recreation, and industry development head2right
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