A conservationist who has protected the Critically Endangered black rhino is awarded the 2011 Goldman Environmental Prize.

Nitrogen pollution from farms, vehicles, industry and waste treatment costs the EU up to £280bn a year, a report says.

The birth of a new subduction process could see Europe starting to burrow its way under Africa, geologists suggest - reversing the pattern seen over many millions of years.

The US Navy has fired a laser gun from one of its ships for the first time. The weapon was used to disable a small boat.