Environmental thinking and activism are steadily gaining widespread, even global acceptance, but are often in conflict with economic interests and international politics. Environmental priorities are further challenged by scientific uncertainty involving effects that in some cases will only become manifest far into the future. Nonetheless, accompanying this global environmental awakening has been an extraordinary number of international agreements on a wide range of critical environmental issues. While many of these environmental regimes lack adequate financial support and sanctions for non-compliance, they involve a variety of non-state actors, suggesting meaningful movement towards an evolving, complex form of global environmental governa...