The Prince of Wales warns of the "catastrophic" consequences of inaction on issues such as climate change, at a UN sustainability conference in Brazil.

Volcanologists in Colombia warn of the activity of Nevado del Ruiz as a plume of ash and smoke continues to rise from its crater.

Black bears demonstrate they have counting abilities during touch-screen computer tests.

China's Shenzhou-9 capsule, carrying the nation's first female astronaut, links up with the Tiangong-1 space lab.

An IBM supercomputer owned by the US government leapfrogs Asian rivals to become the world's fastest.

Governments must seize the "historic opportunity" of the Rio+20 summit to put the world on a new sustainable course, says an expert panel.