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It's been linked to a year of extremes – from bushfires to torrential rains – but what is it?

Sir Richard Branson's Virgin Galactic embarks on the first crewed flight of its rocket-powered tourist plane.

Sir Richard Branson's Virgin Galactic embarks on the first crewed flight of its rocket-powered tourist plane.

As the UK hosts a key climate summit, the government announces an end to funding for overseas oil and gas.

The world has seen the biggest annual fall in CO2 emissions since World War Two, say researchers.

Lake sediments on remote Marion Island tell the story of the Southern Hemisphere's westerlies.

European bison take a step back from the brink, but there is bad news for other animals and plants.

The new Sentinel satellite to track global sea-level rise is in excellent shape, say space officials.

A letter has been signed by singer Ellie Goulding and Hollywood stars Emma Watson and Emma Thompson.

Sir Richard Branson's Virgin Galactic embarks on the first crewed flight of its rocket-powered tourist plane.

As the UK hosts a key climate summit, the government announces an end to funding for overseas oil and gas.

The world has seen the biggest annual fall in CO2 emissions since World War Two, say researchers.

Lake sediments on remote Marion Island tell the story of the Southern Hemisphere's westerlies.

European bison take a step back from the brink, but there is bad news for other animals and plants.

The new Sentinel satellite to track global sea-level rise is in excellent shape, say space officials.

A letter has been signed by singer Ellie Goulding and Hollywood stars Emma Watson and Emma Thompson.

As the UK hosts a key climate summit, the government announces an end to funding for overseas oil and gas.

The world has seen the biggest annual fall in CO2 emissions since World War Two, say researchers.

Lake sediments on remote Marion Island tell the story of the Southern Hemisphere's westerlies.
It's been linked to a year of extremes – from bushfires to torrential rains – but what is it?
By David Edmonds
BBC World Service

By Matt McGrath
Environment correspondent
By Jonathan Amos and Victoria Gill
Science correspondents, BBC News
By Sandish Shoker
BBC News, East Midlands
By Rebecca Morelle
Science correspondent, BBC News
In the latest Climate Check from BBC Weather, Sarah Keith-Lucas looks back at a year of extreme heat, exceptional rainfall and record CO2 emissions.
The decline of 2.4 billion tonnes is the equivalent of taking approximately 500 million cars off the roads each year

By Jonathan Amos
BBC Science Correspondent

By Matt McGrath
Environment correspondent