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The prediction that glaciers will be gone from Glacier National Park has been moved up by 10 years to 2020, the same year it's predicted the Arctic Sea will be ice-free in the summer.

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.

Glacial pace is actually an incorrect concept. The glaciers move a lot faster and they react a lot faster than people imagine.

The entire North Polar ice cap is disappearing before our very eyes. It's been the size of the continental United States for the last 3 million years and now 40 percent is gone and the rest of it is going.

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.

This air we breathe is precious, and the glaciers helped me understand that and stay focused on that.

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 ages have come and gone. Coral reefs have persisted.

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.

But with the slow menace of a glacier, depression came on. No one had any measure of its progress; no one had any plan for stopping it. Everyone tried to get out of its way.