These are some of the reasons why, though the black carbon in brown clouds has a warming effect, the clouds' net effect is to cool the planet beneath them.

这就是为什么尽管褐云中的黑碳会产生变暖的效应，但这些云的净影响是冷却云下面的地球。这是一部分原因。

youdao

But that effect was offset by warming-associated drought that limited growth in the Southern Hemisphere, resulting in a net global loss of land productivity.

但是，这种积极影响被气候变暖带来的干旱所抵消，限制了南半球的植物生长，导致全球土地生产力出现负增长。

youdao

So planting trees in these climates actually has the net effect of warming the Earth's surface.

FORBES

It means that if we overestimated the soil response to warming then we must have underestimated something else dramatically because we have a net effect of faster global warming.

CNN: Soil study hints at climate model revision