When US startup Make Sunsets released two weather balloons into the skies above Mexico’s Baja California peninsula last year, it kicked up a fierce debate about one of the world’s most controversial ...

What would be the price tag for shielding the Earth from global warming using a chemical cloud? It might be just $1 billion to $3 billion, making a sun-reflecting project much cheaper than combating ...

A once-outlandish idea for reversing global warming took a major step toward reality Friday when Israeli-U.S. startup Stardust Solutions announced the largest-ever fundraising round for any company ...