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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For example. the language and polls expert Frank Luntz wrote a memo encouraging the use of "climate change" because the phrase sounded less scary than "global warming," reported the Guardian.

例如，据《卫报》报道，语言和民调专家弗兰克·伦茨写了一份备忘录，鼓励使用“气候变化”这个词，因为这个词听起来没有“全球变暖”那么可怕。

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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

Has not the time come to demonstrate on solidarity not least solidarity in combating and adapting to climate change and global warming?

FORBES: Got Problems? Blame Global Warming

"That's when I sat back and said, I just started a conversation about global warming and climate change and the parts per million of CO2 in our atmosphere on a NASCAR forum, " she said.

CNN: She's racing to save the environment

No-one is denying that, if managed properly, biofuels such as ethanol can offer very subsatial benefits, and have a significant role to play in the battle against global warming and climate change.

CNN: Biofuel: Green savior or red herring?