And this so-called greenhouse gas forcing on the climate system is well-understood.

这些所谓的温室气体，对气候系统施加强迫性，这一点已经得到了很好的理解。

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In particular, they write, external forcing "largely attributable to greenhouse-gas forcing" is responsible for "a best guess of 75 percent of the observed winter warming since the late 17th Century."

特别是，他们写道，外部强迫‘可以把它归功于温室气体的压迫’，自17世纪后期以来，观测的冬季变暖最佳猜测是75%，这该由温室气体负责。

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The radiative forcing due to human activity in some areas can be comparable in magnitude with the forcing caused by greenhouse gases, such as CO2 etc.

某些地区人为气溶胶的强迫在量值上可与CO2等温室气体引起的强迫相比拟。

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Based upon data from the paper, the cooling climate impact from the decrease in the average global cloud height more than offset the positive forcing from an increase in greenhouse gases from human activities in the last decade.

FORBES: An Unsettling Week For Global Warming's 'Settled Science'