The 21st century middle, because the greenhouse effect, the polar melting glaciers, earth many cities submerged.
21世纪中期，由于温室效应，南北极冰川融化，地球上很多城市被淹没。
The summer is hot enough, maybe it's because of the greenhouse effect.
全球暖化是因为温室效应的结果。
The summer is hot enough, maybe it's because of the greenhouse effect.
全球暖化是因为温室效应的结果。
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