• 'Jeremiahs' list their great hopes for 2007
• More romance, better old age and better death

Scientists often find themselves accused of pessimism. From the gravity of their public warnings about the dangers of climate change or bird flu, they have earned a reputation as Jeremiahs with a bleak view of human nature and humanity’s future.

It is a charge most researchers contest vigorously: science, they say, is a profoundly optimistic pursuit. The idea that the world can be understood by gathering evidence, to the ultimate benefit of its citizens, lies at its heart. It is not just about problems, but about finding the solutions.

The breadth of this optimism is revealed today by the discussion website Edge.org — often likened to an online scientific “salon” — which marks every new year by inviting dozens of the world’s best scientific minds to answer a single question. For 2007, it is: “What are you optimistic about?” The answers show that even in the face of such threats as global warming and religious fundamentalism, scientists remain positive about the future.