On this week's show, we here from a man described by the Washington Post as "one of the world's most influential thinkers" and whose advice, former president Bill Clinton, advised us to "all heed".
Lester Brown, founder of the US-based Earth Policy Institute and a titan of the environmental movement who alerted the world to the potential dangers of biofuels, talks to John Vidal about his latest guide to save the planet.
Ahead of George Bush's climate change conference in Hawaii David Adam asks climatologist, Robert Henson, whether anything will come out of it. Henson, has also written the new Rough Guide to Climate Change, and he explains why ditching bottled water is one of the best ways of saving CO2.
And we're in Britain for the Campaign of the Week. We hear from Greenpeace at a demo against Heathrow's proposed third runway.
John Vidal, the Guardian's environment editor, and, Rebecca Smithers, consumer affairs correspondent for the paper, are in the studio to discuss the week's news including the McDonald's green make-over.
And Guardian Unlimited's acting editor, Jessica Aldred, has this week's pledge from Tread lightly - to help you cut your CO2 - reusing plastic bags.
Guardian Weekly is presented by Alison Benjamin.
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