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one of the satellites that we use to

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study the earth is the terra satellite

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which has on board a number of different

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instruments a big one is called modis

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and it takes pictures of the earth's

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surface

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and studies plant life among other

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things and we're able to look at the

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earth's surface and see how much plants

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are growing and we can even determine

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how much carbon dioxide plants take out

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of the atmosphere as part of the

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photosynthetic process

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and so what we look at is the entire

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global landscape we look at how much

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carbon is being taken out of the

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atmosphere into plants and we look at

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how our use of the land surface

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especially with agriculture and

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urbanization affects surface temperature

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and then how that surface temperature

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then affects climate

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such as rainfall which is also very

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important for the production of plants