SAN JOSE, Calif. — 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 ...

We’re all taught that water is clear, so why does the ocean look so strikingly blue when we’re staring out at it? It turns out the colour isn’t about the water itself being blue, but about how light ...

From brightening ocean clouds to launching sulfur dioxide into the stratosphere, some entrepreneurs and scientists are testing technology that... The Sunday Story: Startups want to cool Earth by ...

California startup Reflect Orbital plans to launch thousands of satellites with mirrors to redirect sunlight to solar farms at night. Astronomers warn the bright reflected light could be “ruinous” to ...

There is a moment each year when the Arctic stops reflecting light and starts holding it. It does not announce itself.