The ex-mayor of Curitiba used massive creativity and tiny budgets to create the world's greenest cityThere are times in life – admittedly very few indeed – when you really wish Boris Johnson was in the same room as you. Last night was one of them as the revolutionary Brazilian ex-mayor, Jaime Lerner, spoke at London's British Film Institute as part of its Of Dreams and Cities season."You have to keep things simple, and just start working ... You have a lot of complexity-sellers in this life. We should beat them, beat them with a slipper," said the 70-year-old former mayor of Curitiba, the world's most environmentally friendly city. He has the look of an ex-boxer and a military bearing, softened ...