Governments need to improve material efficiency to avoid a global resource crunch and dangerous climate change, say scientists.

A controversial theory of smell involving quantum physics receives a boost as scientists test the idea using human subjects.

The incoming governor of the Bank of England says the next two years will be "decisive" for bank reform and warns central banks alone cannot eliminate economic risks.

US President Barack Obama pays tribute to Hillary Clinton in a joint interview, as both dodge speculation about a presidential bid by Mrs Clinton.

The government launches its Green Deal, with householders offered long-term loans to make their homes more energy efficient and cut bills.

Brazil declares three days of national mourning for 231 people killed in a nightclub fire, reportedly started after a musician lit a flare on stage.

Japanese carmaker Toyota regains its slot as the world's biggest vehicle maker, capping a year of a dramatic turnaround in its fortunes.

French-led troops fighting Islamist rebels in Mali have taken control of the airport in the key northern city of Timbuktu, military officials say.