Environment Weekly podcast: Clinton, Obama and McCain plus orang-utans

Alison Benjamin talks to Greenpeace executive director John Sauven about why campaigners dressed as apes are targeting Unilever, plus artist Kurt Jackson on why he's painting for Friends of the Earth

Bill Bryson talks about his campaign to free Britain of litter, we meet Germany's wind power chief and hear from the UN's top climate change official, Dr Rajendra Pachauri

Alison Benjamin talks to the Lib Dem London mayoral candidate about his green credentials. Plus Martin Wainwright on the plight of the country's honey bees

Ken Livingstone's 'green' mayoral race

Alison Benjamin and the panel ask, is this Labour's greenest budget yet? Plus, scientist David Suzuki discusses our failure to tackle climate change. And we report from Grenada, three years on from Hurricane Ivan

Alison Benjamin speaks to the eco-activist Joss Garman about the recent protests by his group Plane Stupid

Wildlife filmmaker and anti-plastic bag activist, Rebecca Hosking on why we're not seeing the real state of our planet on TV

Lucy Siegle examines the week's hot environment stories, with the Guardian's David Adam, and Rob Holdway, corporate environmental adviser

We speak to the Green Party's candidate for London Mayor, Sian Berry, about her plans for the capital; Nottinghamshire's eco-town; plus inside Low Carbon Man's tent

Green credentials of US presidential candidate hopefuls, saving the orang-utan, and giving up CO2 for Lent