What gets measured gets managed, right? This longstanding business maxim gets thrown around a lot in green circles: data’s a necessary element of making the case that sustainability makes sense. At Orange County, California’s Davis Magnet School (which focuses on math, science, and technology), measurement’s already present in the curriculum; now, it’s also a part of the school’s efforts to determine if efficiency retrofits make sense for the district’s bottom line and the students’ performance.