Marcellus Shale natural gas drilling protesters picketed outside of the Renaissance Hotel in downtown Pittsburgh Tuesday. Inside, industry executives from upstream and midstream companies met to discuss environmental challenges, policy and regulations. Stephen Cleghorn, an organic farmer based in Jefferson County tried to crash the summit and deliver a "Bill of Indictment" outlining what the protesters allege are false claims by industry about the safety of shale fracturing. Cleghorn says millions of tons of chemicals are being pumped into the ground "and they don't know what's going to be on the other side of that in terms of how much of that ever gets up into our aquifers." The Marcellus Shale Gas Environmental Conference runs through Wednesday, March 30.