Green news roundup: Planet of the Apes, oil spill and poaching

Environment news • Shell's second oil leak in North Sea pipeline caused by relief valve • GM corn being developed for fuel instead of food • Africa famine: soaring food prices intensifying crisis, report warns • Mekong River dolphin population on the brink of extinction - WWF ‎ • Elephant and rhino poaching 'is driven by China's economic boom' On the blogs • Barack Obama bets on next generation of biofuels industry • My cycling clutter is weighing me down • Is avian malaria a disaster for British birds? • Will Rise of the Planet of the Apes save our endangered primates? Multimedia • Mammals 'caught' in camera traps - in pictures • Everything you need to know about climate change - interactive • The week in wildlife - in pictures • North Sea suffers worst oil spill for 10 years - video Green living • The cheap cotton crisis • Farmers turn away from organic as sales drop • Prince Charles on organic farming Best of the web • Yale Environment 360: Solar-powered homes remain a distant dream for many in the US • Grist: Rick Perry to delight climate sceptics by running for president • BusinessGreen: Offshore wind farms are good for wildlife, say researchers For more of the best environment comment and news from around the web, visit the Guardian Environment Network . ...And finally • Treetop CCTV captures the first flight of an osprey chick An osprey chick has proved it is a great survivor by taking a first tentative flight from its eyrie in Kielder Water & Forest Park in Northumberland