By — PBS News Hour PBS News Hour Leave your feedback Share Copy URL https://www.pbs.org/newshour/show/actress-sigourney-weaver-introduces-james-cameron-film-perils-climate-change-dnc-2016 Email Facebook Twitter LinkedIn Pinterest Tumblr Share on Facebook Share on Twitter Watch Watch the Full Episode PBS NewsHour from Jul 27, 2016 By — PBS News Hour PBS News Hour