A Search for Unity

The first of this year's series of BBC Reith lectures is available to listen to or read at the Radio 4 website.

The lectures are presented by the eminent economist Jeffrey Sachs, who speaks of the increasingly threatening global challenges that we face. I suggest that it is worth all of us hearing what he say to say, whether or not we agree with all of it. I think I am guilty of his accusation of being all too pessimistic; I think many of us are. It's too easy to sit back and say things can't be changed.

Was it Einstein who said that the only way to find the limits of the possible was to go beyond them into the impossible?