When it comes to reducing environmental degradation, what specific challenges are presented by globalization (in terms of the free-flow of money, commodities, and people, and the global power of multinationals) vis a vis the institutional limits of national government jurisdictions?

In a world of unequal wealth, different governmental regimes, and very different laws and law-enforcement capabilities, how do we regulate/transform processes of environmental degradation that span the globe? e.g. the felling of the rainforest in Amazonia is in part linked to demand for ethanol in the U.S. Conflicts over oil in Nigeria are linked to the ongoing global growth in demand for oil in the world. What are points of leverage for halting these practices up and down the commodity chains? How does “the world” regulate such processes (given the failure of the WTO to come to even basic agreements that seem fair to all players)? Obstacles include conducting research on the entire length of commodity chains, parts of which are heavily protected by authoritarian governments and secretive corporations.