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provides comprehensive, indepth information about climate change. Learn about the science behind it, greenhouse gas emissions, health and environmental effects, regulatory initiatives, U.S. climate policy, economic analyses, and what you can do at home, at school, and elsewhere. (Environmental Protection Agency)
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Changes in the shape of the Earth's orbit (or eccentricity) as well as the Earth's tilt and precession affect the amount of sunlight received on the Earth's surface. These orbital processes—which function in cycles of 100,000 (eccentricity), 41,000 (tilt), and 19,000 to 23,000 (precession) years—are thought to be the most significant drivers of ice ages. |
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Global sources of carbon dioxide |
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