PBS will air a new three-part documentary series following teen environmental activist Greta Thunberg as she seeks to raise awareness of the accelerating climate change. The documentary titled Greta Thunberg: A Year to Change the World (w.t.) premieres in its entirety as a special presentation on Earth Day, Thursday, April 22 at 8:00-11:00 p.m. ET on PBS stations nationwide. Encore airings of all three episodes air Wednesdays, April 28 – May 12, 8:00-9:00 p.m. ET (check local listings).