Therefore,human activities should not be regarded as the main cause of climate change.“Influences from both human and natural factors should be equally stressed.”Ren said,adding that nobody could be sure at this point whether it was natural influence or the greenhouse effect that was causing the change.
This conclusion came after detailed comparison based on historical records of agricultural production between the warmer periods(1750~1790)and the colder periods(1841~1890).
According to Ren,during the 10,000 years before the industrial revolution,cold and warm periods had appeared alternately(交替地).
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