An Inconvenient Truth was made "carbon neutral" for $496.80

Co-producer Lesley Chilcott used an online calculator to estimate that shooting the film used 41.4 tons of carbon dioxide and paid a middleman, a company called Native Energy, $12 a ton, or $496.80, to broker a deal to cut greenhouse gases elsewhere. The film's distributors later made a similar payment to neutralize carbon dioxide from marketing.

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