Actor Mark Ruffalo is most famous for his work in films like “Eternal Sunshine of the Spotless Mind” and “The Kids Are All Right.” But recently, he has turned his attention to a real-life issue. Ruffalo has become an outspoken opponent of hydraulic fracturing, or fracking, a controversial method of extracting natural gas that has divided citizens of upstate New York, where he lives.
Click here to watch more of PBS Need to Know's take on the hydraulic fracturing debate.
