A couple dudes want to cool the planet by releasing balloons filled with sulfur dioxide. They say they got ‘OKs to launch’ from officials; officials say otherwise. Controversial solar geoengineering startup Make Sunsets says it released three balloons carrying atmosphere-altering particles in Reno, Nevada, this month. It’s an escalation of the company’s questionable climate change-fighting tactics, which got it banned from launching balloons in Mexico in January. And while the company says it got the green light from the FAA and local authorities, officials say no such authorization was granted. The way Make Sunsets explains it, this kind of geoengineering...