They give off a lot of greenhouse gases (especially CO2) into the air. This warms the earth.

它们向空气中释放大量温室气体（尤其是二氧化碳）。这使得地球变暖。

youdao

They give off a lot of greenhouse gases (especially CO2) into the air. This warms the earth.

它们向空气中释放大量温室气体（尤其是二氧化碳）。这使得地球变暖。

youdao