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

So those are all natural causes of climate change.

Widespread water pollution and massive degradation of lakes and rivers.

So what needs to be done?

Anyway, last year, I heard about the Himalayas and the melting of the (Laughter) and the melting of the glaciers because of climate change.

But fossil fuels, carbon coal and gas are by no means the only thing that is causing climate change.

Our energy sources are not sustainable.

For me, what's important.

And, of course, Arctic communities are toast.

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

Climate change is real.

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.

You know, this is really an infinite thing.

Global climatic changes may have been responsible for the extinction of the dinosaurs.

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?

Well, the problem is that we've got very complicated forces in the climate system.

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

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

The accident was caused chiefly by the unpredictable weather.

less stuff.

We're not even slowing down.

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.

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.

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.

And more CO2 causes more warming.

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

I'm just going to talk about two things.

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

You know the climate.

Climate change deniers argue that the Sun is the main cause of climate change.

The game retreated northward

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

When I realized that climate change was real, and it was not based on computer models,

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

They are judge and defendant, they are professional politicians.

What's new is just the degree of it.

Too many factors. It's not that!

Now plants are under threat.