Former New York Mayor Michael Bloomberg wants cities to lead the way on clean energy.
Giffords moves home to Tucson
Former Representative Gabby Giffords has moved home to Tucson. She had been undergoing six to eight hours of therapy a day at a Houston facility after she was shot in the head in January 2011.
Her husband, retired astronaut Mark Kelly, told the Arizona Daily Star that Giffords will continue rehabilitation in Tucson.