Obama urges every US mayor to pursue police reforms in wake of protests
He also directly addressed young Americans of color, telling them, "I want you to know that you matter, I want you to know that your lives matter, that your dreams matter."
Former US president Barack Obama speaks during the North American Climate Summit in Chicago, Illinois, US, December 5, 2017(photo credit: REUTERS/KAMIL KRZACZYNSKI)ByREUTERS