Sir David Attenborough makes stark warning about species extinction

There are the stunning images of animals and plants you would expect from an Attenborough production, but also horrific scenes of destruction. In one sequence monkeys leap from trees into a river to escape a huge fire. In another a koala bear limps across a road in its vain search for shelter as flames consume the forest around it. There is a small army of experts on hand to quantify the scale of the damage to the ecosystems of the world. Of the estimated eight million species on Earth, a million are now threated with extinction, one expert warns. Since 1970, vertebrate animals - birds, mammals, reptiles, fish and amphibians - have declined by 60%, another tells us. We meet the world's last...