Types of animals in danger of extinction., endangered species, Lack of water., water scarcity, Power produced by wind, sun, etc., renewable energy, A machine used to produce electric power., wind turbine, Chemicals and other harmful waste products., toxic waste, Poisonous gases produced by engines of non-electric vehicles., exhaust fumes, Part of the stratosphere which limits the amount of ultraviolet radiation reaching the Earth., ozone layer, Process by which gases trapped in the atmosphere cause the planet to heat up., greenhouse effect

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