In 1968 Stewart Brand produced the first edition of the Whole Earth Catalog. It had a picture of the earth seen from space on the cover and inside were lists of useful tools for transforming the planet by distributing power to the people. I remember seeing it in bookshops. Thrilling and demanding, it called on me to join my generation. Like Woodstock, student demos, dope, tie-dyed T-shirts and improbably flared trousers, the Catalog told us we were different.

We were. But now different has become mainstream. The Catalog was, above all, Green. It treated the planet as a single, finite system whose contents could be catalogued. Now the whole world is Green and the Internet lists its contents. David Cameron and Ed Miliband believe what only