1) too many people in a place a) water pollution b) few green areas c) overpopulation d) turn off the light 2) things that you throw away in a trash can  a) overpopulation b) trash c) turn off the light d) plant trees 3) harmful substances in the water produced by normal people or industries a) water pollution b) traffic c) air pollution d) trash 4) the number of cars moving along roads a) traffic b) plant trees c) overpopulation d) few green areas 5) harmful substances in the air produced by waste from cars or industry: a) few green areas b) turn off the light c) plant trees d) air pollution 6) few parks or forests a) overpopulation b) water pollution c) few green areas d) air pollution

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