Times Argus: You may know your carbon footprint, but do you know your nitrogen footprint? Nitrous oxide is 300 times more potent than carbon dioxide. Nitrogen has been pegged as an over-looked cause of climate change and as a culprit in some of the most insidious forms of environmental pollution. “Nitrogen’s role as a greenhouse gas is mostly as nitrous oxide,” said Jeff Merrell, environmental analyst for the Vermont Agency of Natural Resource’s Air Pollution Control Division. Nitrous oxide …