Environmental activists use the term “sustainable development” to convey the notion that they’re not merely knee-jerk anti-business zealots and that they are all in favor of eco-friendly economic development. That term is put to the test in a new documentary entitled “Mine Your Own Business.” Made by Phelim McAleer, a former Financial Times correspondent, and wife Ann McElhinney, a fellow at the nonprofit Moving Pictures Institute, the film spotlights the efforts of environmentalists to block economic development projects in Eastern Europe, Africa and Latin America. The film starts out in the remote and desolate Romanian village of Rosia Montana, home...