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What is the 'Carbon cycle'?

The amount of Carbon Dioxide CO2 in the air ultimately effects the temperature of the planet - to much will make the planet warmer, not enough will make the planet colder. This is known as the Greenhouse effect.
Photosynthesis is when plants and trees obsorb the CO2. They store the CO2 and release it when they die. Oceans, forests and the soil all absorb and store CO2. As the planet warms up the carbon is released to keep the temperature at an equilibrium.
The problem arises when we humans put to much CO2 into the air - more then the planet can recycle and hence block the heat from being lost into space. This is called Global Warming.

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Photo: The full chemical symbol for Carbon