Saving Nature key to human wellbeing: UN biodiversity chief Robert Watson, the outgoing head of the UN science panel for biodiversity and former chair the Intergovernmental Panel on Climate Change (IPCC), shares his perspective on the importance of preserving nature. "The big issue is consumption per person and therefore it's not just the number of people, it's what we as individuals do," says Watson who unveiled the grim findings of a UN assessment of Nature -- the first in 15 years -- written by 150 scientists and drawing from 15,000 published studies and government reports. IMAGES AND SOUNDBITES of Robert Watson