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With December's crucial Copenhagen climate change summit fast approaching, we talk to 350.org founder Bill McKibben about the politics of climate change in the US, the challenges of building a successful mass movement, and how we set about not only restricting the amount of new CO2 we're pumping into the atmosphere, but reducing the levels that are already there.

350 is the number that leading scientists say is the safe upper limit for carbon dioxide in our atmosphere - it's measured in "Parts Per Million". So below 350 ppm is where we need to be to avoid runaway climate change. Currently the figure is around 390 and rising.

350.org will coordinate an international day of action on October 24 at hundreds of iconic places around the world - from the Taj Mahal to the Great Barrier Reef - with the aim of sparking a global movement to unite the public, media, and our political leaders behind the 350 goal.

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In this edition of our podcast we talk to award-winning film maker Nick Broomfield about his latest project. 'A Time Comes' is an 18 minute documentary about our very own Kingsnorth Six, who were arrested for shutting down a coal-fired power station but found 'not guilty' at the subsequent trial.

But first let's head down to the Airplot to meet veteran comedian and star of fabled 1970s tv series 'The Good Life', Richard Briers. Richard turned up at our plot of land on the site of the proposed new runway at Heathrow to help us dig for victory in the campaign by starting an allotment – Christian Hunt grabbed a spade and went along to meet him.

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See all Rainbow Warrior tour updates or get them by email.

I'd love to be a fly on the wall at E.on's HQ at the moment. When the head of the Women's Institute - along with heads of other groups representing four million people in the UK - boards the Rainbow Warrior, signs a declaration, climbs into a Greenpeace inflatable boat, drives up to Kingsnorth coal plant and hand delivers a declaration saying no to new coal to E.on staff, the company must, surely, be sweating it a bit:

"Kick start clean energy" written on the side of the Rainbow Warrior in LEDs, with London buildings behind. © Will Rose / Greenpeace

See all Rainbow Warrior tour updates or get them by email.

The Rainbow Warrior is a ship full of stories; everywhere on the ship there are photographs of the non-violent direct actions Greenpeace has taken over the years, artefacts from our campaigns, painted totems donated by Native Canadian people, pictures drawn by visitors to the boat, and portraits of crew members past and present. And every time you talk to someone who knows the ship and her history intimately, like the captain, you get the chance to hear more.

There's no way I'd have time to pass on all the stories I'm hearing but I am going to try and record a few of them for you, starting with Mike, the Captain (pictured), telling last night's guests the story of the Rainbow Warrior sailing into the Moruroa test zone. It's quite a story - have a listen to this mp3:

But our visitors last night didn't just hear stories from the past. They also got to hear - and see - a good deal about our present campaign: to give coal the boot and kickstart a clean energy revolution.