Why did politicians use the two terms "global warming" and "climate change"?

为什么政治家们要用“全球变暖”和“气候变化”这两个术语？

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The terms "global warming" and "climate change" are used by many, seemingly interchangeably.

“全球变暖”和“气候变化”这两个术语被许多人使用。这两个词似乎可以替换使用。

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Apparently everyone knows that global warming only makes climate more extreme.

显然，每个人都知道，全球变暖只会让气候变得更加极端。

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Critics say the messages show climate change scientists discussing ways to discredit other theories about global warming.

VOA: special.2009.12.12

Swan is optimistic that humans can take the necessary collective steps to address climate change and put the brakes on global warming.

VOA: standard.2009.12.10

Wednesday,China's envoy on climate change negotiation, Yu Qingtai,placed blame for current global warming trends squarely on developed nations.

VOA: standard.2009.11.26

Fifty-three percent of likely voters said they believe that global climate change and warming is a legitimate problem.

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Carbon emission contributes to global warming and climate changes affecting our water supply and quality.

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Joe Romm, author of the global warming blog Climate Progress, was equally unimpressed by the program.

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