The idea is simple: spray a bunch of particles into the stratosphere, and they will cool the planet by reflecting some of the Sun’s rays ... first to fly under the banner of solar geoengineering.

As demand for air conditioning climbs, some see a solution in the very thing that makes us sweat: the Sun. At Hotel Star Sapphire in Dawei, Myanmar, guests sip from coconuts in cool, air ...

A new project in Los Angeles is trying to cool the city by painting streets with a reflective coating to bounce away heat from the sun. Other cities like Phoenix are undertaking similar efforts.