The UK's chief scientist says the oceans face a serious and growing risk from man-made carbon emissions.
The EU agrees what it calls "the world's most ambitious" deal to cut greenhouse gas emissions by at least 40% by 2030, overcoming deep divisions.
Google executive Alan Eustace breaks the world altitude record for a parachute jump set two years ago by Felix Baumgartner.
Surgeons in Australia say they have performed the first heart transplant using a "dead heart".
The European Space Agency releases a short sci-fi movie to promote its audacious bid to land on a comet next month.
Skywatchers in North America are treated to the final eclipse of the year.
Campaigners start legal action to prevent the government from capturing a family of wild beavers.
Small tags stuck to the undersides of baby loggerhead turtles are used to follow the animals' frenetic first hours.
The extinction of the biggest shark known to science may have triggered whales to grow to their current hefty sizes, a study suggests.
Farmland birds are at their lowest levels since records began, according to government figures.
DNA analysis of a 45,000-year-old human has helped scientists pinpoint when our ancestors interbred with Neanderthals.
A significant Bronze Age pottery find is made during an archaeological dig on the east side of Lewis, in Scotland.
Two dinosaur skeletons have been unearthed in Mongolia, solving a mystery that has baffled palaeontologists for 50 years.
A black and white image of lions resting on a rock outcrop in the Serengeti has won the 2014 Wildlife Photographer of the Year award.
The UK's wind farms generated more power than its nuclear power stations on Tuesday, the National Grid says.
People living in Roman Britain had healthier gums than their modern-day descendants, a feat of archaeological dentistry shows.
The Queen sends her first tweet to launch the London Science Museum's ambitious new Information Age gallery.
Researchers reveal that the same physical mechanism is behind many of nature's most dazzling shines.
Roman gladiators had a diet that was mostly vegetarian, according to an analysis of bones from a graveyard where the fighters were buried.
The first animals to copulate were small fish that lived 385 million years ago in what is now Scotland, a study suggests.
A paralysed man becomes the first in the world to walk again following a pioneering therapy which involved transplanting cells from his nose into his severed spinal cord.
An unmanned US military plane on a secretive two-year mission in space has returned to Earth in California.
Audi says one of its self-drive test cars topped 149mph (240km/h) at a race track in Germany, beating a human-driven version.
The EU's decision to ban the use of some pesticides could threaten UK crops, increase food prices and hit farmers' profits, a report claims.
IPCC expert says EU's plan consigns future leaders to “extraordinary and unprecedented” CO2 cuts.
UK planning experts are to advise Chinese mayors on the benefits of building environmentally friendly cities.
Investors are seeking funding from the UK government for an ambitious plan to import solar energy generated in North Africa.
Bee colonies in Brisbane are waging war for months on end, according to a new study, and the victorious swarms are taking over the hives of rival species.
A deadly new disease has emerged in Spain that is wiping out amphibians, scientists report.
Two of the rarest birds of prey in England, which had been satellite tagged, vanish in unexplained circumstances.