Some scientists, such as atmospheric chemist Paul Cruzen, who has had ties to Stockholm Uuniversity and the University of California, are thinking very big indeed about how to stop global warming, writes Diana Furchtgott-Roth.

Forget mere cuts in carbon. Think instead about geoengineering aspects of the Earth’s environment, for example, spraying clouds with salt water to enhance their reflectance.

More power to these grand imaginers.