Air-conditioning units, which often use HFC gases, on a building in Shenyang, China
Visual China Group via Getty Images
Emissions of a powerful greenhouse gas released as a byproduct in the manufacture of refrigerants are much higher than reported by governments, suggesting a global agreement to stamp out such emissions is failing.
Under the Kigali Amendment to the Montreal Protocol, signed in 2016, more than 160 countries said they would do their best to eradicate emissions of HFC-23, a gas with 14,700 times more warming potential than carbon dioxide. Data provided by governments suggest emissions have fallen by more…
Solar drone with wingspan wider than jumbo jet could fly for months
The Skydweller droneSkydweller A solar-powered surveillance drone with a wingspan larger than a Boeing 747 jumbo jet could fly for...
Why Trump’s order targeting ‘woke’ AI may be impossible to follow
US President Donald Trump displays a signed executive order at an AI summit on 23 July 2025 in Washington, DCChip...
Sprinkling limestone on farms may offer an unexpected climate win
Farmers spread lime on pastures to improve the quality of the soilWayne HUTCHINSON/Alamy The centuries-old practice of spreading crushed limestone...
Your chance of having a boy or girl may not be 50/50
A woman’s age may determine whether she has only sons or daughtersMarko Pekic/Getty Images You may assume that a woman’s...
