Carbon dioxide is one of the primary __ gases that cause global warming., greenhouse, house, plant, home, We need to preserve the __ of wildlife because each species has an important role to play., various, population, type, diversity, The effects of climate change on humans and nature are __., temperature, catastrophic, global, risk, Most climate scientists agree the main cause of the current global warming trend is human expansion of the greenhouse __., gas, damage, cause, effect

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