Green light: Countdown to Cancún, tiger summit and cycling in New York

Climate change and Cancún UN summit • UN scientists say emission pledges fall well short of halting climate change • 'In Cancún you can make history,' celebrities tell the world's politicians • Conservative pre-election coal plant emissions promise goes up in smoke • Indonesia eyeing $1bn climate aid to cut down forests, says Greenpeace • Why the salt miners of Uganda's lakes are dying for a deal on climate change • US climate scientists fight back after year of scepticism The Guardian will be joining the world's environment officials and ministers over the following fortnight for the UN climate conference in Cancún, COP16. Read our Q&A for an introduction and watch this space for breaking news on the summit. Wildlife • Leonardo DiCaprio pledges $1m to help save tigers • Putin may be the tiger's champion, but China will decide the species' future • Scottish fishermen plead guilty to 'black landing' of mackerel and herring • Snapshot: Flamingos in formation • Keep an eye out for stranded dolphins, urge scientists Multimedia • In pictures: 2010 Landscape Photographer of the Year Awards 2010 • In pictures: The salt miners of Lake Katwe in Uganda • In pictures: Inside Burma's illegal trade in tigers • In pictures: The week in wildlife Green and ethical living • New York trails: Learning to ride a bike in Manhattan • Could earthships help deliver Britain's low-carbon future? • How can I be sure what I'm buying is suitable for vegetarians? • You ask, they answer: Intelligent Energy Post your questions for hydrogen experts, Intelligent Energy Best of the web • SciDev.net: Haiti's cholera epidemic caused by weather, say scientists • Grist: Bicycle safety by numbers: a US perspective • Mother Jones: Departing Republican attacks climate-change deniers in own party For more of the best environment comment and news from around the web, visit the Guardian Environment Network . And finally... • Twitter gaffe: US embassy announces 'crazy bad' Beijing air pollution Unexpected phrase in US embassy's hourly pollution tweet gives its followers cause for amusement and concern