If you take a video of a spinning wheel, you’ll probably notice that the spokes appear to turn more slowly than the wheel is actually rotating, and sometimes in the wrong direction. This is caused ...

A 100,000-ton carrier retrofitted with spinning sails shows how wind-assisted propulsion can reduce fuel consumption and CO₂ ...

The upshot: we’ve been able to calculate what needs to happen with renewable energy to reach climate targets, but not how ...