Carbon dioxide and plant emissions
 Emissions from the biosphere
Read about the chemical compounds emitted by plants, which are found as trace gases in the atmosphere.
Carbon dioxide as a greenhouse gas
Read about carbon dioxide as a greenhouse gas, how its mixing ratio has varied over centuries and millenia. Have a look where it comes from and where it goes.
Seasonal cycle of phytoplancton
Read about the growth periods of phytoplankton, which is another important sink of carbon dioxide and can be regarded in some way as 'forest of the ocean'.
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