text: In other words, we should worry about the risks of climate change; we should worry about the risks of geoengineering; and we should apply our most meticulous and careful scientific thought to characterizing these risks. But we should not considerindeed we should remain utterly unaware ofthe risks of forcing wealthier people to stop using, and preventing poorer people from starting to use, the fossil-fuel energy that played a leading and essential role in the vast improvements in human health, prosperity, and life expectancy during the last hundred years.