Climate engineering carries serious national security risks − countries facing extreme heat may try it anyway, and the world needs to be prepared
- Written by Ben Kravitz, Assistant Professor of Earth and Atmospheric Sciences, Indiana University

The historic Paris climate agreement started a mantra from developing countries: “1.5 to stay alive.” It refers to the international aim to keep global warming under 1.5 degrees Celsius (2.8 Fahrenheit) compared with...