Two pipelines from Russia to Germany are leaking, and the natural gas inside them is bubbling to the surface of the Baltic Sea and venting into the atmosphere. The leaks are a potential environmental disaster, given that methane—the key ingredient in natural gas—is a potent greenhouse gas.
In a worst-case scenario, the greenhouse-gas emissions from just one of the pipelines could equal the annual emissions of two million cars, according to Andrew Baxter, a methane expert at the Environmental Defense Fund.
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