An Israeli team has proposed deploying an immense sail in orbit to create an artificial shadow on the Earth's surface. The device joins the club of technical and scientific ideas, known as ‘geoengineering’ The objective is to intentionally manipulate the weather to change its effects.

In Australia, we are testing the spraying of seawater particles on clouds in order to increase their albedo, their ability to reflect the sun's rays and protect the Great Barrier Reef from possible heat waves. Subscribe Already subscribed? To log in.