How important is reciprocity for climate policy?

The Paris Agreement relies on voluntary and therefore weak commitments. But contrary to popular belief, if some countries "free-ride", this does not undermine the commitment of others, writes Thomas Bernauer.

Fewer low clouds in the tropics

With the help of satellite data, ETH scientists have shown that low-level cloud cover in the tropics thins out as the earth warms. Since this cloud cover has a cooling effect on the climate, the two-degree warming target ...

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