Match the following environmental problems (1-4) with their description (А-Д).
1. to overfish


2. greenhouse effect


3. overpopulation


4. waste disposal


А. the action or process of throwing away waste materials


Б. when there are too much people in some area


В. the contamination of water bodies (e.g. lakes, rivers, oceans, groundwater and aquifers)


Г. to empty the stock of fish in a body of water by too much fishing


Д. the problem caused by increased quantities of gases such as carbon dioxide in the air

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