气候变化是全人类面临的重大挑战，需要国际社会合力应对。
Climate change is a grave challenge to mankind and calls for a concerted international response.
答：气候变化问题是全人类面临的重大挑战。
A: the issue of climate change is a major challenge facing the entire human race.
答气候变化问题是全人类面临的重大挑战。
The issue of climate change is a major challenge facing the entire human race.
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