Inter Press Service: Sao Paulo emits only a tenth of the greenhouse gases that San Diego produces, even though this Brazilian metropolis is four times larger than that city in California, according to a report released today by the United Nations Human Settlements Programme (UN-Habitat). Based on such comparisons, the State of the World’s Cities 2008/2009 — a report published every two years by the UN agency, which in this new edition focuses on “Harmonious Cities” — concludes that the contribution of …