In one of the first scenes of Ice on Fire , a new climate documentary produced and narrated by Leonardo DiCaprio, a scientist drives a snowmobile to a tiny cabin on a ridge in the Rocky Mountains and turns on a pump that sucks outdoor air into a glass flask so it can be taken to a lab to measure how much CO2 is in the atmosphere. In another scene, it shows bubbles of methane–a greenhouse gas far more potent than carbon dioxide–escaping from an Arctic lake as the permafrost melts. The film, which travels around the world, wanted to show how climate science happens, and explain the basics of the problem of climate change through the people studying it. It also dives into solutions. [Photo: courtesy HBO] “Science has long proven that we have existing technologies that work and they are already being implemented,” DiCaprio says in the film, which premieres tonight on HBO. “It’s become a matter of political will and scale.” With beautifully shot imagery, the film visits groups like the Redwood Forest Foundation in California, where dead trees are turned into biochar, a form of charcoal that can help capture carbon in soil on farms, […]

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