Match the vocabulary to the correct definition.
1. Global warming
2. An ecosystem
5. Renewable energy
6. Fossil fuels
9. The greenhouse effect
a. Energy sources that are naturally replenished by nature.
b. Cutting down forests.
c. Contamination of air or water by harmful substances.
d. An increase in the world's temperature due to pollution.
e. Chemicals used on soil to increase its fertility.
f. A community of plants and animals which support one another.
g. The release of gases, usually by cars or factories, into the air.
h. Heat being unable to escape the atmosphere causing global warming.
i. Polluted air which is a mixture of smoke and fog.
j. Coal, oil and natural gas.
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