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太阳在一定时问内给予地球的热量是在1837年被测出的,以后一直没有变化。但从1978年开始便逐年下降,如果这种情况持续半个世纪的话,那么我们从太阳那里得到的热量将比现在少1％。这种全球性变冷时期在1500—1850年间曾出现过。
The heat given to the earth by the sun at a given time was measured in 1837 and has not changed since. However, it has dropped from 1978 onwards. If this situation lasted half a century, then the amount of heat we get from the sun will be 1% less than it is now. This global cooling period occurred between 1500-1850.