This much-needed book provides an empirically-grounded, and theoretically informed account of international law sources, mechanisms, initiatives and institutions which address and affect the practice of subsidising fossil fuel consumption and production. Drawing on recent scholarship on emerging international governance mechanisms, ‘informal’ international law-making and regime interaction, it offers suggestions, and critiques suggestions of others, for how the international law framework could be employed more effectively and appropriately to respond to environmentally and fiscally harmful fossil fuel subsidies.