As drilling for natural gas continues in states across America, PBS’s “Need to Know [1]” bores down into the issue by taking a closer look at the safety concerns that surround the drilling process known as hydraulic fracturing [2]. In a report produced in collaboration with ProPublica reporter Abrahm Lustgarten, the program investigates how fracking threatens to contaminate drinking water sources for millions of Americans.

And for those of you who complain that we don’t feature enough celebrities in our work, “Need to Know” talks to actor Mark Ruffalo [3] about why he opposes fracking. “Need to Know” airs over the weekend on PBS stations across the country. Click here [4] to find your local station and show time.