I'm not a big reader of Dystopian or Utopian literature but I'll go with Aldous Huxley on both counts.
Brave New World - Like xstatic has noted, you can witness its ugly prophecies in the evening news, eighty years after it was written.
Island - In contrast to Brave New World, Island is Huxley's vision of a better way of living. Huxley was 'the intellectual's intellectual' and Island, being his last novel, feels like a coming together of his work and reading in the realms of humanism, philosophy, medicine and sociology. The ending, without giving too much away, is one of literature's greatest indictments of the our addiction to oil.