We are close to a knowledge of annual summer and winter temperature variations over much of the northern hemisphere going back 600 years.

我们很快就会知道，600年前北半球大部分地区每年夏季和冬季的温度是如何变化的。

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If I then put it back into its original condition, lower the heat say, temperature back to body temperature and reduce the pH down to seven again, the molecules will re-nature.

假如我把烧杯的温度恢复到初始状态,降低温度,温度降低到体温,将pH值降低到七,这些分子会复性

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But Met Office critics went a step further: if it has under-estimated the natural forces holding back temperature increases, maybe the Earth is more resilient in the longer term to greenhouse gases than previously thought?

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The helium, which by then will have risen to about minus 15C, is pushed through a liquid nitrogen "boiler" to bring it back down to its run temperature, before looping back into the pre-cooler.

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So if the average earth temperature back then was 70 degrees, it is now 72 degrees.

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