Climate change or global warming is caused by increased levels of carbon dioxide (C02) and other polluting gases in our atmosphere.
Heat from the Sun (a) is trapped by the gases in our atmosphere (b)
The gases trap heat by forming a blanket around the Earth - like the glass of a greenhouse.
Once released the greenhouse gases stay in the atmosphere for many years. As they build up, the planet's temperature rises.
Greenhouse gases are released by burning fossil fuels - coal, oil and gas - and by cutting down forests.
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