3 Read the text again. Match the words in the box with the definitions.
sustainable energy renewable energy
alternative energy fossil fuels biofuel
1 comes from sources that do not damage the
environment.
2 comes from sources that do not run out.
3 ... gives us energy without affecting the supply
in the future.
4 ... comes from material like plants.
5 are formed over millions of years from the
remains of plants and animals.
