WHAT are greenhouse gases and how do they make Earth warmer?

以二氧化碳为主的温室气体是如何使地球变暖的呢？

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The second theory is based on the fact today, the global warming but the irony is that global warming will not only make the earth warmer but will fall the earth back to ice age.

第二个理论是全球温度升高，具有讽刺意味的是这不仅导致地球变暖还会在未来把地球带回冰河时代。

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Which makes earth, and in particular, the northern hemisphere, warmer.

这使得地球变暖了，尤其是北半球地区。

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And the most important information underlying them is, well, what happened previous times the Earth got warmer?

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Forty million years ago, when the earth was warmer because there was more carbon dioxide in the air as a result of volcanic eruptions, the oceans are thought to have been 70 meters (or 229 feet) higher.

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The Earth is warmer now than during 70 to 80 percent of the time stretching back to the last Ice Age, according to researchers from Oregon State and Harvard universities who studied data from more than 73 global sites.

FORBES: What Excellent News: Earth Warmer Than in Most of the Past 11,300 Years