Fossil fuel is non-renewable. It takes millions of years to form and is made up of organic matter such as plants.

Coal is the most used fossil fuel.

People use up 80 million barrels of oil every day.

1 gram of uranium gives same energy as 3.5 tons of coal but it takes millions of years for nuclear waste to be disposed.

Renewable energy sources, like wind, solar and hydro power, can be replenished naturally in a short period of time. Non-renewable sources, like oil, gas, coal and nuclear power, cannot.