Mumbai, August 27 "People talk a lot about carbon footprints. But our personal footprints are much bigger than that. And they are social as well as ecological. The people and the pollution that sustain us are invisible to us.' - Excerpts, Confessions of an Eco Sinner It was a strange obsession to find out where his everyday commodities actually came from that sent Fred Pearce, environmental journalist and London-based author, to developing countries like India, Bangladesh, China and South Africa. Today, after having travelled across the globe to track his "personal footprints', Pearce says he has returned with a surprising shot of optimism "about humanity and the huge potential we have to run our world better'. Pearce has travelled some 1,80,000 km on his journey, visiting more than 20 countries and all six continents. In Mumbai, to launch his new book