The world is, finally, awakening to the imminent threats posed by climate change and pollution, and London is starting to do its bit to help. From zero-emissions streets to pollution-eating solar panels, along with restaurants trending towards zero-waste and veganism, the capital has begun to put greener, more sustainable methods into practice. Next in the war on global warming are three new City Trees, a series of CO2-filtering structures which have just been installed in Leytonstone.