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| | Natural History: The good Earth |
 | | Scroll down the "Earth Observatory" site to "animations" on the right, where you'll find the composite maps compressed into a short film (download the larger, twenty-megabyte version if you have a fast Internet connection). |
 | | Every eight days for the years 2001 and 2002, NASA combined land-based data with data from Terra and Aqua, two Earth-orbiting satellites, to generate composite maps of the world's "net primary production" of carbon dioxide--the amount absorbed during photosynthesis, minus the amount given off during respiration. |
 | | Photosynthesis helps cool the atmosphere by absorbing carbon dioxide, a greenhouse gas, and it is a critical factor to consider in forecasting climate change and global warming [see "Heat Exchange," by Robert Ehrlich, page 58]. |
| www.findarticles.com /p/articles/mi_m1134/is_3_113/ai_n6057242 (646 words) |
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