The park is well wooded.

But, in fact, they're grassland habitats for grassland birds and plants.

Compared to grassland management

This picture is a typical seasonal grassland.

Let's see, there's a wooded lake a couple of miles north of here.

This town now plans to relocate and rebuild schools in safer wooded hillocks.

And I also like to think of offices as being a temperate grassland.

So on this bit of grassland, we'll do it, but just in the foreground.

And when they reached Central Asia, they reached what was effectively a steppe super highway, a grassland super highway.

Now, looking at this grassland of ours that has gone dry, what could we do to keep that healthy?

And it's looking up on the wooded heights of Washington Heights to Jeffrey's Hook, where the George Washington Bridge goes across today.

But fire also leaves the soil bare, releasing carbon, and worse than that, burning one hectare of grassland gives off more, and more damaging, pollutants than 6,000 cars.

Now, all of that grass you see aboveground has to decay biologically before the next growing season, and if it doesn't, the grassland and the soil begin to die.

Still, in this place, in this grassland where you can see our very first office there on that hill, four years later, there is this one green blop on the Earth's surface ... (Applause)

But if you do not look at grasslands but look down into them, you find that most of the soil in that grassland that you've just seen is bare and covered with a crust of algae,

And as the night breeze carries our little craft away... from these beautiful wooded shores... we slowly turn our eyes back to the charms of television advertising... and the lyrical chant of our sponsor s message... after which I il float back.

I began helping a family in the Karoo Desert in the 1970s turn the desert that you see on the right there back to grassland, and thankfully, now their grandchildren are on the land with hope for the future.

So I then began looking at all the research plots I could over the whole of the Western United States where cattle had been removed to prove that it would stop desertification, but I found the opposite, as we see on this research station, where this grassland that was green in 1961, by 2002 had changed to that situation.

We are already doing so on about 15 million hectares on five continents, and people who understand far more about carbon than I do calculate that, for illustrative purposes, if we do what I am showing you here, we can take enough carbon out of the atmosphere and safely store it in the grassland soils for thousands of years, and if we just do that on about half the world's grasslands that I've shown you, we can take us back to pre industrial levels, while feeding people.