Ah, Benny's parents, thanks for coming.

Hiya.

So, Benny has really blossomed this term.

You're telling me, he outgrew his bike. We sold it, on eBay.

Oh, that's not quite what I meant.

It's free to sell on there.

Free to sell?

Easy too. Sold Benny's bike, your guitar, my jacket.

You sold my guitar?

Shall we talk about Benny?

When it's this easy to sell for free, you can't help but say when it's eBay.

Things people love.

T's and Cs apply, exclusive vehicles.

Welcome to this special web extra edition of Science Talk, the podcast of Scientific American, posted on December 23, 2010.

I'm Steve Murski. On this episode,

The environmentalists have been very, very good about identifying the problems we need to solve.

They're horrible at picking what the answers are.

So I actually believe most environmentalists, most of the time, are getting in the way of progress, real economic progress.

That's Vinod Kossela. He's perhaps the world's best-known investor in clean technologies.

Kostla was interviewed recently by Scientific American editor Mark Fischetti at the Going Green Conference in San Francisco, part of which became a Q&A in the January issue of the magazine.

Here's an edited version of that interview.

This is Vino Kostla. I'm sure most of you know him.

...