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.

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

Our energy sources are not sustainable.

75 minutes.

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

Climate change is real.

Don't we already know how they affect temperatures?

And, of course, Arctic communities are toast.

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

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

You know, this is really an infinite thing.

We're not even slowing down.

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

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

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

We're saying that you cannot solve the problem of climate change in one country you've got to involve all countries.

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

less stuff.

And more CO2 causes more warming.

And when we have overwhelming problems in front of us, we tend to seek simple answers.

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

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

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.

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

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

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

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

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

We're running out of land.

Now plants are under threat.

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

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.

The game retreated northward

Here we have our secrets.

Those flags represented the countries from which my team came from.

What's new is just the degree of it.

I'm just going to talk about two things.

When I first realized that we had no option as scientists but to use much vilified livestock to address climate change and desertification,

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