"Tax expenditures are a major source of support for energy related activities in the federal budget exceeding direct budget support for energy by a factor of nearly six. Focusing on the policy goals of reducing greenhouse gas emissions and petroleum consumption, I find these tax expenditures...

Biofuels have gained increasing attention as an alternative to fossil fuels for several reasons, one of which is their potential to reduce the greenhouse gas (GHG) emissions from the transportation sector. Recent studies have questioned the validity of claims about the potential for biofuels to...

Concerns about energy security, reduced dependence on exhaustible fossil fuels and climate change have led to significant policy support for biofuels, particularly for cellulosic biofuels. The Biomass Crop Assistance Program and volumetric tax credits for biofuels seek to supplement the...

Biofuel greenhouse gas (GHG)-reduction standards calculated via life-cycle assessment are shown to be biased, even when indirect land-use change is included, because they are based on physical GHG emissions and uptakes and on simple aggregates of balances. We offer a GHG-reduction standard for...