Editors' Summary: In this Article, Kerry E. Rodgers presents an overview of Germany's current efforts to reduce carbon dioxide (CO2) emissions from cars, including discussions of the proposed European Union legislation to set binding CO emissions targets for cars and supporting measures. She identifies several factors that appear to be driving Germany's efforts: (1) ambitious national commitments to reduce CO emissions; (2) the desire to show global leadership on climate protection; (3) recent events that have drawn public attention to climate protection and "clean cars"; and (4) traditions in German environmental policy such as a political and scientific consensus on the need for climate protection, the tradition of viewing environmental regulation as a way to competitive advantage, and public experience with taxes as an environmental policy tool. She also identifies perceived challenges for change, including the car industry, consumer behavior, and features of governance structures, and argues that the debate in Germany over CO emissions from cars merits watching because of its potential significance for three areas of environmental policy: (1) the future of voluntary, self-regulatory agreements in Europe; (2) the value of an international legal and political framework in developing national environmental policy; and (3) the interrelatedness of environmental policies toward cars with broader energy and transport policies and climate protection initiatives.