Associated Press: Former New York mayor Michael Bloomberg was appointed Friday to be the U.N. special envoy for cities and climate change, a position that will give the billionaire businessman and philanthropist an international stage to press for action to combat global warming. Secretary-General Ban Ki-moon chose Bloomberg, who made combating climate change a major focus of his 12 years as mayor and was very outspoken on how cities should be run to cope with ever increasing populations without harming the environment....