Most Americans treat climate change seriously but not literally — they accept the science, worry about forecasts but tell themselves that someone else will get serious about fixing the problem very soon. The Valve Turners, on the other hand, take climate change both very seriously and very literally. In the fall of 2016, the group of five environmental activists — all in their 50s and 60s, most with children and one with grandchildren — closed off five cross-border crude oil pipelines, including the Keystone. On today’s Sunday Read, who are the Valve Turners and what are their motivations? This story was written by Michelle Nijhuis and recorded by Audm. To hear more audio stories from publishers like The New York Times, download Audm for iPhone or Android.