"Johnson also told the Environment Agency's annual conference that the economic downturn presented a "huge opportunity" for the capital by creating new green jobs, offering opportunities to reduce emissions as well as households and companies' energy bills.
"There is a huge opportunity for us to go greener and cleaner and cheaper at the same time," he said.
Simple changes to buildings to make them more energy efficient could save small- and medium-sized businesses £725m a year, declared the mayor."
"The Tory mayor, famed for scorning the global warming agenda in the past, sought to throw off his image as the man who used to write caustic articles about the 'religion of climate change' by saying that his mind had been changed by the incontrovertible science. 'If the climate can change, I don't see why my mind can't,' he said."