PBS News Hour S42 E109 June 1, 2017

Thursday on the NewsHour, President Trump breaks from nearly all nations in the world by abandoning the landmark Paris agreement aimed at combatting climate change. Also: The head of the UN refugee agency on the U.S. responsibility to help migrants, a new book that addresses the "new urban crisis," new developments in the Russia file and a Brief but Spectacular take on living with Alzheimer's.