Climate change may not have been on the official Rio+20 agenda, but that didn’t stop mayors from megacities around the world from making major headway on the issue. At the Rio+20 conference on Tuesday, the network of C40 city leaders announced new data showcasing the fact that these cities' initiatives could cut 1.3 billion metric tons of carbon emissions by 2030.
At the decidedly urban event—perched in a colorful, high-tech auditorium miles from Rio+20’s official negotiations in the suburbs—Mayors Bloomberg (NYC), Paes (Rio de Janeiro), Park (Seoul), and Tau (Johannesburg)—as well as President Clinton (via video) and other leaders—made a compelling case for global action through cities. The mayors asserted that cities are proving to be the most effective government entities in addressing global climate change. In addition to announcing goals to reduce 1.3 billion metric tons of carbon emissions by 2030, leaders cited already-taken actions that will cut 248 million tons of greenhouse gases by 2020. The cities’ achievements contrast with international negotiations (and some national governments), which have been unable to agree to binding CO2 reduction targets.