Green news roundup: Keystone XL, Boris Island and shark fin soup

Environment news • Keystone XL pipeline: Obama rejects controversial project • Tougher 30% emissions cut would be cheaper than expected: report • Shale oil and gas 'will make US self-sufficient' • David Attenborough urges business to protect nature from population boom • Shangri-La hotels take shark fin soup off the menu On the blogs • How Boris Island is blocked by his father's great work • Boris Island airport: economy trumps environment once again • Dip in nuclear power support after Fukushima proves shortlived • What impact will the Costa Concordia disaster have on the environment? Multimedia • Boris Island airport versus Thames estuary wildlife - interactive map • Be a citizen scientist and stop the spread of invasive species in Britain - in pictures • Sea Shepherd activists injured in clash with Japanese whaling vessel - video • The week in wildlife - in pictures Features • How the Boris Island airport would impact Thames estuary wildlife • Greg Barker MP: The green deal will be the biggest home energy programme of modern times • Protecting France's Mediterranean salt marshes, a haven for migratory species • Best of the web • BusinessGreen: Scottish Independence push will not disrupt renewables investment • IPS: Pakistan's forests fall victim to the Taliban • SciDev.net Include trees in climate modelling, say scientists • Grist: Honeybee problem nearing a 'critical point' For more of the best environment comment and news from around the web, visit the Guardian Environment Network . ...And finally • Hedgehog survey seeks public help Study into effects of climate change on survival and hibernation of hedgehogs wants public to record sightings of animal