CA A windmill?

WK Yeah. The windmill.

William Kamkwamba on building a windmill

WK I wanted to make a windmill.

CA And so, and that windmill, what it worked?

You end up like some kind of rabid windmill.

And you didn't know about the windmill, you know?

It said a windmill could pump water and generate electricity.

So I decided I would build one windmill for myself.

CA And what did you make the windmill out of?

There I am like a bloody windmill again, you see.

I had never seen a windmill until I visited the Netherlands.

When the wind is blowing, any excess energy coming from the windmill is diverted into the battery.

WK In fact, a design of the windmill that was in the book, it has got four ah three blades, and mine has got four blades.

When he was just 14 years old, Malawian inventor William Kamkwamba built his family an electricity generating windmill from spare parts, working from rough plans he found in a library book.

At age 14, in poverty and famine, a Malawian boy built a windmill to power his family's home. Now at 22, William Kamkwamba, who speaks at TED, here, for the second time, shares in his own words the moving tale of invention that changed his life.

The cost will be 1 billion, but the EU says that this is incredibly cheap when compared to the cost of inaction on climate change, which will run into the trillions. It should be obvious that the 1 billion windmill doesn t negate the trillions of dollars of damage from climate change that we still have to pay by the end of the century.