The tidewater south, Georgia.

Drangajökull Glacier

And the same glacier today.

The glacier moves but by inches.

The glacier moves but by inches.

That's the retreat of this glacier.

This is happening in glacier national Park.

We're now at the Columbia Glacier in Alaska.

This is pitched on a glacier at 17,500 feet.

This is Argentina 20 years ago. Same glacier today.

I actually made a device called the Glacier Embracing Suit.

This compression is seen when the glacier calves, creating a blue iceberg.

No. It was retreating through the winter because it's an unhealthy glacier.

This glacier has doubled its flow speed in the past 15 years.

Within 15 years, this will be the park formerly known as glacier.

Here is what's been happening year by year to the columbia glacier.

The one glacier up in Greenland that puts more ice into the global ocean than all the other glaciers in the northern hemisphere combined is the Ilulissat Glacier.

According to scientists, in 100 years all the mountain glacier will be gone.

But this glacier caved into the water and a seal got on it.

And to the right hand side of us was this great Khumbu Glacier.

In the Andes, this glacier is the source of drinking water for this city.

When I meet a glacier for the very first time, what do I do?

And all the way along the glacier we saw these big pools of melting ice.

One day, I still remember... the glacier melted, and the icebergs drifted to the north.

Like Al Gore told you, two billion people live on the water from the glacier of Himalaya.

This is a rock field, and under the rocks, there is still some ice from the glacier.

This lake has been formed in the last couple of years because of the melting of the glacier.

You see the glacier flowing in from the right, dropping off into the sea, camera shooting every hour.

This very basic shift in my physical orientation helped me shift my perspective in relation to the glacier.

And once again, it's this invitation that asks people to lay down on the glacier and give it a hug.

We certainly have movement of the glacier sheets, but overall definitely colder, an icy environment, but very rich in animals as well.

The main stem, the main flow of the glacier is coming from the right and it's going very rapidly up that stem.

Okay. We had a team out watching this glacier, and we recorded the biggest calving event that's ever been put on film.

They actually have these buses that drive up and over the lateral moraine and drop people off on the surface of the glacier.

But, in any case, the deflation of this glacier since 1984 has been higher than the Eiffel Tower, higher than the Empire State Building.

And so glaciers are these magnificent beings, and there's lots of reasons to be obsessed with them, but what I'm particularly interested in is in human glacier relations.

60,000 Indians on pilgrimage to the end of a dirt road that leads to the sacred valley, called the Sinakara, which is dominated by three tongues of the great glacier.

At the end of the Iast ice age, as the Iast glacier was receding from North America, the ice melted and a giant pool of fresh water formed in North America.

Once an iceberg breaks away from the glacier or ice shelf, it will usually live for three to six years, floating around, carried by the currents and tidal movements of the ocean.

I was on Bowman Lake in Glacier National Park, which is a long, skinny lake with sort of mountains upside down in it, and my partner and I have a rowing shell.

And these cameras are positioned on rocks on the sides of the glaciers, and they look in on the glacier from permanent, bedrock positions, and they watch the evolution of the landscape.

When snow on the glacier is compressed over many hundreds of years, the weight of the snow forces the air bubbles out of the ice, creating pure ice with very little air trapped inside.

It is the force of gravity that pulls them towards the sea, where a glacier may calve off to become an iceberg or continue to spread up as an ice shelf or an ice tongue.

Here's a mother and her two year old cub were traveling on a ship a hundred miles offshore in the middle of nowhere, and they're riding on this big piece of glacier ice, which is great for them they're safe at this point.

Yes the climate in Montana is getting warmer and drier, but Montana agriculture depends especially on irrigation from the snow pack, and as the snow is melting for example, as the glaciers in Glacier National Park are disappearing that's bad news for Montana irrigation agriculture.