1) Pollution a) dirty water, air and atmosphere b) making water, air, atmosphere dirty and dangerous for people and animals to live in c) people who make water, air and atmosphere dirty and dangerous 2) Environment a) an organization that wants to protect the natural world. b) air, water and land in which people, animals and plants live c) something that we do to prevent air and water pollution 3) Ecology a) plants growing in some area b) natural balance between plants, animals, people and their environment c) part of medicine that helps people to lead a healthy life 4) Greenhouse effect a) a building in a garden or park which has glass walls and a glass roof in which you grow plants; b) a salad made mainly with green vegetables; c) the problem of temperature rise in the Earth's atmosphere

Ecology

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