(Laughter)

I've got data to back up all these assertions, by the way.

This makes a Hydrogen economy unlikely.

We can do the same for geothermal energy and solar power.

I love renewables. But I'm also pro arithmetic. (Laughter)

China leads their explosive growth and their plummeting cost.

I have a stake in these, so I'll have a disclaimer there.

As of 2007, there are only about 4 square miles.

(Laughter)

Went straight to the president.

For the first time, this year the cost of solar generated electricity is 50 percent that of diesel generated electricity in India 8.8 rupees versus 17 rupees.

And in six months they can become solar engineers.

We're using energy we can harvest on our roofs, and also on the training pitches, which will be covered with large, flexible membranes, and we will see in the next years an industry coming up with flexible photovoltaics, giving the possibilities of shading against strong sun and producing electric energy in the same time.

They're speaking to each other and actually becoming solar engineers.

Since I installed solar panels on my house, my energy bill has been cut in half.

I'm, first of all, renewable energy's biggest fan.

And the technology that we settled on as an ideal partner for the Seawater Greenhouse is concentrated solar power, which uses solar tracking mirrors to focus the sun's heat to create electricity.

This was from Nature magazine.

CA All right. So this is only one string to your energy bow.

pennsylvania's exercising leadership on solar power and wind power.

Yeah. I believe we don't really appreciate what we have, and I only speak for myself.

Two terawatt hours, it's roughly half what the U.S. solar industry produced last year.

There's massive P.V. arrays on the roofs as well as wind turbines.

He knows more about solar than anyone I know anywhere in the world guaranteed.

Those three women have trained 27 more women and solar electrified 100 villages in Afghanistan.

We'd have concentrated solar power plants at intervals along the way.

And trust me, I've got a day job, I've got a lot of day jobs.

Setup Solar Wind

The sun sends out light.

Likewise, with solar, especially here in California, we're discovering that the 80 solar farm schemes that are going forward want to basically bulldoze 1,000 square miles of southern California desert.

This has to be a bridge to the point where you can get to wind, to the point where you can get to solar, to the point where you can get to nuclear and hopefully you won't build the next nuclear plant on a beautiful seashore next to an earthquake fault.

(Music)

They were dependent on solar power and it was believed that they would be unable to survive without an energy source as abundant as the sun.

(Laughter) (Applause)

I love being around these big wind generators.

This is what we teach in the night schools.

Did you see the glare?

MICHAEL We're losing the light!

Light years are about 63,000 astronomical units.

So, what I'm shading here in purple, that part of the Earth that's completely tilted away will never see sunlight.

The output power of a one square meter solar panel is about one watt, so it is difficult to use solar power on a large scale at present.

We're often told though that only coal and nuclear plants can keep the lights on, because they're 24 7, whereas wind and solar power are variable, and hence supposedly unreliable.

In the winter when the Sun is lower in the sky, so maybe the Sun is out here, when the Sun is lower in the sky relative to this point, you see that the rays of the sunlight have to travel through a lot more atmosphere.

Basically, by controlling the genes, you can control multiple materials to improve your device performance.

Yeah.