An estimated 21% of carbon emissions in the United States are attributable to companies, and yet to date there is scant research on how to make firm operations more efficient in terms of reducing pollution. However, the numbers suggest that getting employees to change their behavior could significantly impact climate change. So we partnered with Virgin Atlantic Airways on a field experiment to understand how the behavior of employees—in this case, airline captains—influences fuel efficiency, and how low-cost company interventions can influence their behavior.