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Where I live in Connecticut was ice a mile above my house, all the way back to the North Pole, about 15 million kilometers, that's a big ice cube. But then it started to melt. We're talking about the floods of our living history.

If you compare Everest photographs in 1953 with its current state, things are melting. I imagine if I were a golfer in Indiana, I'd be hard-pressed to believe in climate change because nothing's going on there. But when you're up in the mountains and seeing the glaciers melt away, it's an obvious physical manifestation of a warming planet.

On 15 July 2007, I swam across an open patch of sea at the North Pole to highlight the melting of the Arctic sea ice.

Is there climate change? I live in the shadow of some of the greatest climate change the world has ever seen. It's called the Rocky Mountains. When the glaciers went back.

We believe the ice sheet was not around all the time. It was only around during cool snaps of the climate.

In Iceland, you can see the contours of the mountains wherever you go, and the swell of the hills, and always beyond that the horizon. And there's this strange thing: you're never sort of hidden; you always feel exposed in that landscape. But it makes it very beautiful as well.

Just because you see pictures of glaciers falling into the ocean doesn't mean anything bad is happening. This is something that happens all the time. It's part of the natural cycle of things. We know from measurements that glaciers have been melting for 200 years at least.

Ice shelves in general have episodic carvings and there can be large icebergs breaking off - I'm talking 100km or 200km long - every 10 or 20 or 50 years.

Remember, the Arctic didn't have any ice. And the Northwest Passage was wide open. They were raising grapes in Scotland for God sakes, had a huge winery. Iceland was a farming community. As some of the glaciers retreated they found villages that were covered with ice.

There is a glacier in Iceland, Solheimar, which has retreated a great deal, and every time I go back there and see what's not there any more, it does something to the heart. It makes you realise it's possible for a gigantic natural element to just disappear.