Ice on Fire

The threats posed by climate change are enormous. But what potential remedies might there be? This documentary from Leila Conners and Leonardo DiCaprio, who previously collaborated on The 11th Hour, roams the planet to talk to the innovators who are testing ways to arrest or reverse the warming of the atmosphere. As one expert points out, the cost of investing in something new may have just fallen below the costs of doing nothing. Tuesday, June 11, at 8 p.m., HBO