Geese, ducks and swans that spend winter in the wetlands of Northern Europe are delaying their migration south, say scientists.

US oil company Chevron accepts full responsibility for an oil spill off the coast of Rio de Janeiro.

Archaeologists in Peru find the bodies of dozens of children thought to have been sacrificed between 600 and 700 years ago.

The arrival of two beavers at an enclosure in Ceredigion could one day lead to the animals being reintroduced to the wild in Wales.

Concentrations of greenhouse gases in the atmosphere rose to yet another high in 2010, according to the UN's weather agency.

A rise in the use of "ozone-friendly" HFCs prompts experts to voice concerns that the potent greenhouse gases could pose problems in the future.

Hackers are believed to have destroyed a pump used to pipe water to thousands of homes in a US city in Illinois.

The sense of smell can be improved through training, potentially even regaining lost sensitivity, research suggests.