Globalization is changing the nature and practices of global governance, including those relating to governance of large-scale environmental change. A complex array of actors and institutions now frames and seeks to manage environmental problems in diverse ways, resulting in intersecting spheres of public and private authority that shape governance outcomes. We interpret authority here as the capacity to define the content of rules and norms that shape social, economic, and political processes. 1 Our interest is in how the state, still a dominant actor in global environmental governance, navigates shifting spheres of governance authority in promoting its own policy agenda. In assessing such a role for the state, we focus here on global biofuels governance and the Brazilian state. Biofuels are liquid or gas fuels derived from biomass sources such as starch, sugars, fat, wood, or waste. Although classifying categories of biofuels is subject to debate, so-called first-generation biofuels are associated mainly with (1) sugar or starch from food sources such as sugarcane or corn that is converted to bioethanol, and (2) vegetable oils (soy, rapeseed, palm) or animal fats that are converted to biodiesel. Second-generation biofuels are derived from ligno-cellulosic (woody) sources, while third-generation biofuels are produced from algae. 2 This paper focuses on first-generation biofuels because they are produced on a large scale as transport fuel, and are now under intense scrutiny with regard to sustainability and potential competition with food security. 3 The environmentally friendly characterization applied to such biofuels in the early years of their development now faces sustained critiques because of an array of assumed negative effects arising from their production and use. These include increased deforestation and land clearing, accusations of land-grabbing,