President Barack Obama has inaugurated his second term with an ardent call for unity, but warned his foes their "absolutism" must not thwart action on climate, immigration and gun control.

A 5.9-magnitude earthquake struck off Indonesia's Aceh province Tuesday, killing an eight-year-old girl and injuring seven others, officials said.

President Barack Obama inaugurated his second term with an ardent call for unity, but warned his foes their "absolutism" must not thwart action on climate, immigration and gun control.

Claims that global warming can be braked by dissolving huge quantities of rock in the sea to absorb carbon emissions are laden with flaws, a study published on Tuesday says.

US President Barack Obama vowed to make climate change a priority as he was sworn in Monday to a second term, using some of his most forceful language yet despite uncertain political prospects.

The EU executive Monday urged a quick decision on a freeze of 900 million tonnes of pollution credits auctioned to firms in 2013-2015 in order to raise the price of carbon and make investment in clean technology worthwhile.

A US spacecraft orbiting Mars has provided evidence of an ancient crater lake fed by groundwater, adding further support to theories that the Red Planet may once have hosted life, NASA said Sunday.

A mystery wave of cosmic radiation that smashed into Earth in the eighth century may have come from two black holes that collided, a study published in a British journal on Monday says.

A US Navy minesweeper that has been stuck on a World Heritage-listed coral reef in the Philippines since last week ignored warnings to avoid the area, a government official said on Monday.

A US spacecraft orbiting Mars has provided evidence of an ancient crater lake fed by groundwater, adding further support to theories that the Red Planet may once have hosted life, NASA said Sunday.

Climate change was thrust to the forefront of the US political agenda recently in the wake of the devastation caused by superstorm Sandy and record high temperatures across the country.

What if nuclear energy offered the world the only chance to escape poverty and control global warming?

On the Internet, nobody knows you're a dog -- but it is getting increasingly easy for someone to figure it out.

Leprosy spreads to muscles and other tissues through a stealth operation in which it reprogrammes key cells in the nervous system, a new study stays.

The Philippines will seek damages from the United States after a navy ship ran aground on a coral reef in a protected marine reserve, an official said Friday.

Temperatures in Sydney on Friday hit their highest levels since records began 150 years ago, after an Australian government agency warned of more frequent and intense heatwaves in the future.

Standards of education in rural areas in India are declining despite huge investments by the government and landmark legislation guaranteeing schooling to all children, according to a major new study.

Temperatures in Sydney on Friday hit their highest levels since records began 150 years ago, after an Australian government agency warned of more frequent and intense heatwaves in the future.

India's Kumbh Mela, the world's biggest religious festival which sees up to 100 million people flock to take a bath in the river Ganges, is good for pilgrims' health, according to a new study.

A weird marine creature that lived 500 million years ago at a time of explosive growth in Earth's biodiversity could be a forerunner of worms and molluscs, a study published on Thursday said.