British author and anti-food waste campaigner Tristram Stuart holds a... News PhotoActivist,Author,Bean,Beauty Product,British Culture,Environmental Issues,Farmer,Growth,Headquarters,Horizontal,Kenya,Nairobi,Supermarket,Talking,UK,United NationsPhotographer Collection: AFP 2013 AFPBritish author and anti-food waste campaigner Tristram Stuart (C) holds a rejected green beans on February 19, 2013 during the Governing Council of the United Nations Environment Programme (UNEP) at the UN headquarters in Nairobi, as he chats with delegates on the extent of food waste grown by Kenyan farmers but rejected by UK supermarkets due to cosmetic imperfections. The campaign aims to promote actions by consumers and food retailers to dramatically cut the 1.3 billion tonnes of food lost or wasted each year -- which, aside from the cost implications and environmental impacts, increases pressure on the already straining global food system –- and help shape a sustainable future. AFP PHOTO / SIMON MAINA (Photo credit should read SIMON MAINA/AFP/Getty Images)