The broadcaster calls on nations to act in agreement as he is appointed People's Advocate at COP26.
Sir David Attenborough fronts a new documentary on lockdown's effect on the natural world.
Climate change could destroy "entire cities" in a matter of decades, says Sir David Attenborough.
By Chris Andrews
BBC News NI
First transmitted in 2013, Sir David Attenborough recalls key moments from his early broadcasting career and shares the stories behind them.
By Emma Saunders
Sir David Attenborough discusses the climate crisis with the UN Secretary-General António Guterres.
Not only has he given his name to the UK's new polar ship but Sir David has also lent his voice.
By Jonathan Amos
BBC Science Correspondent
A personal reply from Sir David Attenborough has heartened a group of environmental campaigners in Carlisle.
The "Save Deer Park Field" group is opposing plans to build up to 80 homes on an area of land near the Kingmoor Sidings Nature Reserve.
The group says the area is popular with nature enthusiasts, but Carlisle City Council planning officers have recommended approval at a meeting tomorrow.
Pat Duncan from the campaign said Sir David said he understood their concern but as he knew nothing about the site itself, they should contact the Cumbria Wildlife Trust.Copyright: ReutersQuote Message: That this great man took the time and the effort to hand-pen a letter with some advice, meant a lot not just me but too all the people who are in the Deer Park Field Group." from Pat Duncan