It's an interesting paradox when you think about it: production and consumption activities heavily concentrated in cities have contributed to some 80 percent of all greenhouse gas emissions. Yet innovative solutions to combating climate change will also come from cities.
Take the Japanese district of Yokohama, for instance. Home to more than 3,5 million people, the district emitted almost 20 million tons of CO2 in 2007 because of ongoing forest and farmland degradation and extensive construction work. The consequences were significant, as the increase of buildings and paved surfaces resulted in an urban heat island effect that slowed the cooling of the land surface.
Via Mário Carmo