Green news roundup: Pollution, pesticides and peat

Environment news • Nasa scientist: climate change is a moral issue on a par with slavery • Greg Barker calls for 30% emissions reduction target • London air pollution climbs agenda in mayoral election • Study traces devastation of North American bats to Europe • £20m wave energy competition unveiled • Chilean court rejects opposition to Patagonia dam On the blogs • Grave threat of pesticides to bees' billion-pound bonanza is now clear • Boris Johnson, gluing pollution to the ground is no way to clean up London • Vicious words mark the war between pro and anti-nuclear environmentalists • Austerity has not made people care less about the environment • Gardeners should end their love affair with peat Multimedia • Pantanal: protecting the world's largest wetland - video • The week in wildlife - in pictures • Water photography – your Green Shoots photographs • Delivering lambs at Great Tre-rhew Farm – in pictures Features and comment • Pollutionwatch: UK experienced top levels of air pollution in March • Ethical living: how do I water my homegrown veg? • Caroline Spelman: The UK must adjust to ever-changing weather events • Drought hits bluebell numbers over Easter weekend • Q&A: How will the hosepipe ban affect you? Best of the web • £540m insulation scheme targets fuel poor households • Story of illegally dumped chromium in China wins environmental press award • How the internet is powering the fight against Beijing's dirty air For more of the best environment comment and news from around the web, visit the Guardian Environment Network . ...And finally • Desperately seeking … a ring ouzel Country diarist Ed Douglas goes in search of these mountain blackbirds