“Nova” explores new discoveries and how we have come this far. Except where otherwise noted, all times below are Wednesdays at 8 p.m. on Arizona PBS.
August 28: “Lethal Seas”
Oceans absorb about a quarter of the carbon dioxide in our atmosphere. With carbon emissions sharply rising, the silent killer is entering the seas at a staggering rate – raising the oceans’ acidity. Follow scientists who are seeking solutions, including a unique coral garden in Papua New Guinea that offers a glimpse of what the seas could be like in a half-century. (Also Thu. 8/29 at 2 a.m.)
Sept. 4: “Rise of the Superstorms”
Dive into the devastation wrought by Hurricanes Harvey, Irma and Maria. How can scientists better predict these storms, and what does the 2017 season tell us about the likelihood of future storms? (Also Thu. 9/5 at 2 a.m.)
Sept. 11: “Treasures of the Earth: Gems”
Delve into Earth’s depths to discover how precious stones are forged and what explains the allure of each captivating gemstone. (Also Thu. 9/12 at 2 a.m.; Sun. 9/15 at 1 p.m.)