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Glaciers are almost gone from Glacier National Park.

The North Pole will be ice-free during summer in years to come, and that itself will put the Arctic Sea basin on a very high risk of... environmental disasters that might be there.

Remember in 1973 the same science chatter said that the coming Ice Age is going to occur, we're going to lose millions of people. And the politicians knew how to solve it, they just didn't have the courage to solve it; they were going to put coal dust on the Arctic.

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.

Some studies suggest that the Arctic Ocean may be ice-free by the end of the century.

Global warming isn't a prediction. It is happening.

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.

The alpine environment is very delicate. I've been able to see change in the mountains in the 20 years that I've been climbing full-time. Glaciers have receded. The tree-line is changing. That's very rapid to see nature changing in a 20-year period.

Is it 10 years, 20, 50 before we reach that tipping point where climate change becomes irreversible? Nobody can know. There's clearly a probability distribution. We need to ensure this planet, and we need to do it quickly.