Huge ice island breaks away from Greenland glacier

The second-largest ice island in 50 years - twice the size of Manhattan - has broken away from Greenland's Petermann Glacier.

Solar storm warning system will help protect astronauts

With a solar storm washing over the Earth this weekend, it's welcome timing for a new solar radiation warning system that gives more warning than ever before.

US wind power grid could provide reliable supply

Researchers have proposed a wind power grid linking offshore turbines along the east coast of the US as a way of smoothing out fluctuations in supply.