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Carbon cycle
 
The carbon cycle

Carbon dioxide (CO2) is the main greenhouse gas of concern. A finite amount of carbon is stored in fossil fuels, the sea, living matter and the atmosphere.

Without human influence, transfers between these stores roughly balance each other for example, plants absorb carbon as they grow, but release it as they decay.

But when humans cut down trees or burn fossil fuels, they release extra carbon into the atmosphere, increasing the greenhouse effect.


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