Al Gore's demands.

With every natural disaster, even earthquakes being blamed on global warming, the Goracle 's words are increasingly highly prized.

Al Gore has come under fire for making personal gain from his mission to save the planet – after charging £3,300 a minute to deliver a poorly received speech.

The former American Vice-President was also accused of being "precious" at the London event, demanding his own VIP room and ejecting journalists, despite hopes the star-studded gathering would generate publicity for the fight against global warming.

Many of the audience at last month's Fortune Forum summit were restless as Mr Gore, who has won both a Nobel Peace Prize and an Oscar for his campaigning work this year, delivered the half-hour speech that netted him £100,000.