Environmentalists say that some of the largest methane polluters in the state are benefiting from a sleight of hand built into a deeply flawed emissions reporting system. They say those large-scale polluters might not be who you expect, pointing to a little-known natural gas producer called Terra Energy Partners. According to federal greenhouse gas emissions data, this small, privately owned company – headquartered in Texas, but operating exclusively on Colorado’s Western Slope - was the fourth largest source of methane emissions from the oil and gas industry in the entire United States in 2019.