As we see the spread of it, we see national hubs emerging.

Our energy sources are not sustainable.

For me, what's important.

So what needs to be done?

And I'll mention them the emission of CO2, climate change, the fact that we have the responsibility of the acceleration of the climate change.

There's two great forces that are both volitional but inevitable.

Climate change is real.

And, of course, Arctic communities are toast.

We have now, and are the first generation with, the power to do this.

75 minutes.

In the U.K., the Thames Barrier protects London from storm surge.

Because, quite literally, if agriculture doesn't adapt to climate change, neither will we.

Okay? We cannot reduce animal numbers to rest it more without causing desertification and climate change.

Don't we already know how they affect temperatures?

less stuff.

You know, this is really an infinite thing.

We're not even slowing down.

And you need to deal somehow break the link between human actions that change climate, and the climate change itself.

There are very, very few people who don't know now about what is happening in the Arctic.

And the same thing is true for people who are in absolute crisis. Right?

It may surprise you that it's not only climate.

We, the people, still believe that our obligations as Americans are not just to ourselves, but to all posterity.

They've got no points of land more than about six feet above sea level.

And he used to be the USA Today Monday morning guy.

Beyond these technical solutions, our work at the Georgetown Climate Center with communities encourages them to look at what existing legal and policy tools are available and to consider how they can accommodate change.

And we know the solar output's not constant through time.

And more CO2 causes more warming.

I realized that, that I have to respond.

They are both two branches of the same field of atmospheric science.

So, we're not sure where this story is going to end, whether it's got a happy or sad ending.

And I think it really summarizes where we are here.

So those are all natural causes of climate change.

You know the climate.

So this is a call, a plea, to the incredibly talented TED community.

The game retreated northward

That is the change needed to restore energy balance and prevent further warming.

And even at that time, with the introduction of agriculture, 8,000, 10,000 years ago we started to see climate change.

Most of the things mentioned in our 1981 paper were facts.

What's new is just the degree of it.

I'm just going to talk about two things.

It is difficult to adapt oneself to sudden changes of temperature.

We see and feel the climate changes, the droughts and the flooding, the storms and the heat.

The climate is changing.

Yet, there was more energy coming in than going out.

I can't think of anything else that's happened in my lifetime that way.