FiveThirtyEight: We Have Ways To Stop Rogue Scientists. They Don’t Always Work.
"The same week that news of He’s experiments came out, the journal Nature ran a story about a team at Harvard that is planning the first real-world experiments in geoengineering — releasing particles of calcium carbonate into the high atmosphere over part of the southwestern United States. It’s part of a project to develop a way to block sunlight and hopefully reduce the global average temperature (but not by too much). The tests could start as early as next year."