Understanding terrestrial carbon processes is a major challenge in climate science. We define the satellite system required to understand greenhouse gas biogeochemistry: our study is focused on Amazon wetland CH
4 emissions. We find that future geostationary satellites will provide the CH
4 measurements required to understand wetland CH
4 processes. Low-earth orbit satellites will be unable to resolve wetland CH
4 processes due to a low number of cloud-free CH
4 measurements over the Amazon basin.
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