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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In the Northern Hemisphere, warmer temperatures and a longer growing season allowed plants to grow more.

在北半球，温暖的气候以及较长的生长季节促使植被大量生长。

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Starting around 7000 B.C., and for the next four thousand years, much of the Northern Hemisphere experienced temperatures warmer than at present.

大约从公元前七千年开始，在四千年当中，北半球的温度比现在高。

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As spring approaches in the Northern Hemisphere, warmer weather, sunnier skies and often still-significant snowfall continue to draw skiers and boarders to the slopes.

BBC: The ski gear that could save lives

Which means, in the Northern Hemisphere what you might call "the getting warmer seasons" spring and summer are collectively seven days longer than "the getting colder seasons, " fall and winter.

NPR: Not All Seasons Are Created Equal

It is clearly getting warmer in the northern hemisphere.

BBC: Ice records reveal warming trend