As director of the EPA's Office of Transportation and Air Quality, Margo Oge helped lead the charge to implement federal regulations designed to slash vehicle emissions and double fuel economy to a 54.5 mpg average by the 2025 model year. Those rules, finalized in 2012, harmonized auto industry regulations imposed by the EPA, Department of Transportation and California state authorities for the first time, and have become a major part of the Obama administration's push to slow climate change.