fossil fuels, fuels, such as gas, coal, and oil, formed underground, endangered species, animals and plants that are in danger of becoming extinct, greenhouse effect, a warming of Earth's surface and the air above it, recycle, to make something new from something that has been used before, solar energy, energy obtained from solar power, exhaust fumes, gases ejected from an engine as waste products, natural habitat, an ecological or environmental area where a specific species lives, ozone layer, the layer of ozone that protects the planet from the radiation of the sun, rain forest, a thick tropical forest in an area where there is a lot of rain, contaminate, to dirty something

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