However, to date, there has been no consensus about this pre-eminent policy instrument being regulated by international economic law through the World Trade Organization, international investment agreements, and free trade agreements. Munro addresses this issue by evaluating whether carbon units qualify as 'goods', 'services', 'financial services', and 'investments' under international economic law and showing how international economic law applies to emissions trading scheme in diverse and unexpected ways. Further, by engaging in a comparative assessment of schemes around the world, his book illustrates how and why all emissions trading schemes engage in various forms of violations of international economic law which would not, in most instances, be justified by environmental or other exceptions. In doing so, he demonstrates how such schemes can be designed or reformed in ways to ensure their future compliance.