Pollution - The presence in or introduction into the environment of a substance which has harmful or poisonous effects., Acid Rain - Rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes, Ozone Layer Depletion - Caused by the use of CFCs in the past., Deforestation - The action of clearing a wide area of trees., Rubbish - Waste material; refuse or litter., Global Warming - The gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants., Climate Change - The long term effect of an increase in global temperatures., Extinction - When whole species die out., Plastic Pollution - The unwanted addition of organic polymers such as polyethylene, PVC and nylon on the land and the world's oceans., Greenhouse Effect - The process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere.,

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