Reuters: The fight against the destruction of nature can start in cities, even as urban centers around the world face the challenge of accommodating more people, skyscrapers and transport systems. While green groups at a U.N. environment meeting in Japan focused on the need to save rainforests and oceans, mayors at the talks said conserving nature in cities was equally vital. “We must work on two levels. First, the preservation of ecosystems but also the integration of biodiversity in the city and in…