Associated Press: Mayors from more than 350 cities across Europe signed an EU climate change agreement Tuesday pledging to cut carbon dioxide emissions by more than 20 percent by 2020. The pact covers urban areas across 23 EU countries and includes cities like London, Paris and Madrid. Cities in Switzerland, Norway, Ukraine and Turkey have also signed it, and faraway places — like New York; Buenos Aires, Argentina and Christchurch, New Zealand — also backed the initiative. European …