Reading Time: 6 minutes In 1962, the US detonated a high-altitude warhead, with a yield of 1.4 megatons of TNT equivalent, some 250 miles above the Earth. The blast expelled the planet’s magnetic field for nearly half a minute, created a brief cavity in the ionosphere, and damaged
Reading Time: 4 minutes On January 24, the Science and Security Board of the Bulletin of the Atomic Scientists officially moved the hands on the Doomsday Clock, which for three quarters of a century has been used to depict humanity’s risk of global disaster from nuclear war. When the clock was first
Reading Time: 4 minutes Last November, government ministers at the 26th United Nations Climate Change Conference of the Parties (COP26) agreed to The Glasgow Climate Pact. It was both ambitious, in setting key targets for emissions reductions by 2030, and also heavily criticized, including by the Sc