Sir David Attenborough's new BBC documentary on climate change has been praised by TV critics.
Climate Change - The Facts, shown on BBC One on Thursday, was a "rousing call to arms", said the Guardian.
In a four-star review, the Times said the veteran presenter "took a sterner tone... as though his patience was nearly spent".
Sir David, 92, has called global warming "our greatest threat in thousands of years".
In its review, The Arts Desk said: "Devastating footage of last year's climactic upheavals makes surreal viewing.
"While Earth has survived radical climactic changes and regenerated following mass extinctions, it's not the destruction of Earth that we are facing, it's the destruction of our familiar, natural world and our uniquely rich human culture.
"In the 20 years since I first started talking about the impact of climate change on our world, conditions have changed far faster than I ever imagined," Sir David said in the film.
"It may sound frightening, but the scientific evidence is that if we have not taken dramatic action within the next decade, we could face irreversible damage to the natural world and the collapse of our societies."