One morning late last year, an RV pulled into a parking lot on the outskirts of Silicon Valley. Inside it was a blue Ikea bag with huge balloons, and metal tanks full of helium and sulfur dioxide gas.

You won't believe what's happening in the world of renewable energy right now. Imagine being able to tap into the sun's limitless power, even after the stars come out. That's exactly what Reflect ...

It seems wild, but there is a chance that reflecting sunlight back toward the sun could cool the Earth. The problem is, the mechanism would eat up huge amounts of space. Douglas A. McIntyre, Editor-in ...

A proposed constellation of satellites has astronomers very worried. Unlike satellites that reflect sunlight and produce light pollution as an unfortunate byproduct, the ones by US startup Reflect ...

Scientists for years have argued over drastic action to cool a warming world. Among the most widely debated is stratospheric aerosol injection, or SAI— injecting reflective particles into the upper ...

In a parking lot and on San Francisco Bay, NPR witnesses two different tests for solar geoengineering to tackle climate change. With much science... Startups want to cool Earth by reflecting sunlight.