In a guarded compound at the foot of the Rockies, government scientists are working on a new kind of global alarm system: One that can detect if another country, or maybe just an adventurous billionaire, tries to dim the sun.

The leap in temperatures over the past 13 months has exceeded the global heating forecasts – is this just a blip or a systemic shift?

Marine cloud brightening (MCB), the spraying of sea salt aerosols or other fine particles into clouds to artificially brighten them and increase the sun’s reflectivity, is a proposed strategy to ward off the full effects of a changing Earth system.

Extreme weather is by definition rare on our planet. Ferocious storms, searing heatwaves and biting cold snaps illustrate what the Earth system is capable of at its worst.

NOAA and United Airlines have announced an agreement to equip a Boeing 737 with a sophisticated instrument package that will record measurements during domestic flights.

When the maritime sector slashed sulfur emissions, it became an accidental experiment in geoengineering.

Aboard the deck of a World War II-era aircraft carrier, University of Washington scientists flicked the switch on a glorified snow-making machine, blasting a plume of saline spray off the coast of Alameda, Calif.

Scientists are testing an idea in the Bay Area for cooling our warming planet.

In Alameda, scientists are embarking on a novel attempt to cool the Earth — by spraying salt into clouds.

Earth’s stratosphere has never seen the amounts of emissions and waste from rockets and satellites that a booming space economy will leave behind.

For the past few decades, the entire planet has been conducting an experiment that could save us from Earth system change disaster.

Carbon credits have come under fire recently, as regulators, analysts and media take a closer look to see if and how well these credits represent actual benefits for the Earth system.