There is a lot we know about climate change, but there is also a lot we don't know. Even if we knew how much CO2 will be emitted over the coming decades, we wouldn't know how much temperatures will rise as a result. And even if we could predict the extent of warming that will occur, we can say...

A major goal of the environmental movement is to conserve or improve the natural environment, but evidence showing that environmental mobilization produces positive environmental outcomes is mixed. This paper addresses a fundamental question about the relative impact of pro-environmental...