Our colleague Andrea writes: In my hometown, Belo Horizonte, in Brazil, the State of the World Forum launched the international "2020 Climate Leadership Campaign". The magazine that I work for supported the event and published 12 pages about it. I was requested to conclude this covering by doing an analysis of the campaign. I decided then to talk about the power and the role of the cities to combat climate change, since the campaign will be launched in many other cities around the world (the next is Washington). Framing all the analysis was the Climate Summit for Mayors, parallel event of COP15. All the best, Andrea.