It's been 10 years since the creation of the first vertical forest, Milan's Bosco Verticale. How has it inspired other buildings – and affected their residents' happiness and health? In 2007, Italian architect Stefano Boeri witnessed the frantic construction of a city in the Dubai desert dominated by energy-wasting skyscrapers covered in glass, ceramic and metal. All these materials, he tells the BBC, "reflected sunlight, generating heat in the air and especially on the urban ground, where pedestrians walked". (BBC News)