The legendary BBC presenter has sent a scathing warning to the richest nations ahead of the COP26 climate change talks. Sir David was speaking at Kew Gardens in London during filming for a new landmark series, The Green Planet, to be aired next year. He told the BBC that the world faces a "really catastrophic" doomsday scenario if there is no action, adding there is a "moral responsibility" on them now.

       Sir David stressed the recent IPCC report, that issued a "code red" for humanity over climate change proved that he and others had not been making "a fuss about nothing".

       He added: "What climate scientists have been saying for 20 years, and that we have been reporting upon, you and I both, is the case - we were not causing false alarms.

       "And every day that goes by in which we don't do something about it is a day wasted. And things are being made worse".

       But he said the report had not convinced everyone and that they are acting as a brake on efforts to tackle climate change.

       "There are still people in North America, there are still people in Australia who say 'no, no, no, no, of course, it's very unfortunate that there was that forest fire that absolutely demolished, incinerated that village, but it's a one-off'.

       "Particularly if it's going to cost money in the short term, the temptation is to deny the problem and pretend it's not there.

       "But every month that passes, it becomes more and more incontrovertible, the changes to the planet that we are responsible for that are having these devastating effects.

       "If we don't act now, it will be too late. We have to do it now."

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       And he did not stop there. Sir David highlighted some of the impacts that will be seen in the short term.

       Sir David was echoing the thoughts of many scientists – who last week revealed 99% of them agree humans have caused climate change.

       How it is dealt with now is imperative, or it could risk human extinction and the end of the world as we know it.

       While past extinctions have been due to primarily volcanic eruptions and meteorites, the sixth major extinction is forecasted to be from human behaviours.

       Climate change is occurring at an alarming rate – studies by the IPCC show that it is estimated that the temperature will rise from about 1.4C to 5.5C if action is not taken.