Freeman Dyson warns us in Imagined Worlds that he is now 'an old scientist pretending to be a sage' and that 'we learn from science and from history that the future is unpredictable.' As well as diagnosing our present ills, however, Dyson offers strong hopes that our descendants will colonise not just their own galaxy in its entirety, but others too. They could continue onwards for infinitely many years. Humans would have first to survive the difficulties of the next few centuries. On the grounds, however, that he has 'nothing fresh to say', Dyson resolves to pass over in silence 'fashionable environmental problems such as global warming and overpopulation' - although he does later indicate that his hopes are pinned on local, not global solutions. 'People who try to impose global solutions should remember,' he writes, 'the words of the poet William Blake, "One Law for the Lion and Ox is Tyranny".'

LRB 5 June 1997 | PDF Download