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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恢復自動保存: ?