By 2050, experts predict that 75 percent of humans will live in megacities like the polluted, overcrowded mess imagined in this lively, provocative six-part series—Ecopolis, population 18 million and rising. In the first five episodes, climate scientist Daniel Kammen chooses possible solutions to Ecopolis’ manifold challenges, such as food and water production, waste management, and energy efficiency. The Center of Alternative Technology then calculates how his choice would affect the city’s carbon footprint, and in the final episode, the five chosen ideas are ranked in order of urgency. Monday, Dec. 8, at 9 p.m., Science Channel