When a creature or plant dies, its remains slowly get absorbed into the earth and sometimes (after many hundreds of millions of years), with exposure to heat and pressure in the earth's crust, they transform into crude oil, coal and natural gas.

We can access these 'fossil fuels' and convert them to energy for use in our homes, cars, schools and factories. But every time we use these forms of energy we also cause carbon dioxide (CO2) emissions to be released into the earth's atmosphere, which are bad for the planet.

It's important we reduce the amount of energy we use.

 
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