Observer: The growth of developing economies in Africa, Asia and South America has accelerated global warming far beyond official predictions and it is developed nations that must act to halt the potentially catastrophic consequences, according to a new study from the world’s leading temporary power supplier, Aggreko. The warning, which has shocked environment campaigners, comes from Aggreko’s chief executive, Rupert Soames, who said: ‘The threat of global warming is far greater than people …