The decline and fall of English?

This morning's Radio 4 Today programme had a good segment on the future of the English language featuring expert opinion from top applied linguist, David Graddol (whose excellent Open University books on language change and diversity, I'd thoroughly recommend). Is English going to remain the world's favourite language, or will it decline as other world powers, like India and China, start to dominate the globe?

You can listen to the clip here.