ecology - the branch of biology that deals with the relations of organisms to one another and to their physical surroundings., pollution - the presence in or introduction into the environment of a substance which has harmful or poisonous effects., climate change - a change in global or regional climate patterns,, greenhouse effect - the trapping of the sun's warmth in a planet's lower atmosphere,, global warming - a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect,

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