Billions of dollars currently targeted at fighting Aids could in a few years be redirected to tackling climate change - increasing the urgency for bigger steps soon against the killer disease, the world's largest Aids foundation has warned.

Jon Liden, spokesman for the Global Fund to Fight Aids, Tuberculosis and Malaria, said that members of the G8 group of wealthy nations were "under pressure" to be more specific about their pledge at the Heiligendamm summit last month of $60bn for tackling Aids and other diseases.