Reuters: Five hundred European Union cities pledged on Tuesday to exceed the EU’s climate targets, signing up to do more to cut their emissions of climate warming gas. The EU plans to cut carbon dioxide emissions to one fifth below 1990 levels over the next decade, but the coalition of cities signed up to the Covenant of Mayors which aims to outperform that goal by sharing knowledge and low-carbon strategies. “Smart green buildings, smart transport and logistics and, in general, the …