The team hopes to make anaerobic digestion more efficient and profitable for farmers who convert manure to natural gas.
Supporters say the concept has the potential to accelerate emission reductions in transportation and agriculture.
Critics say a recent report on decarbonizing transportation understates the importance of reducing driving.
Bates College says conversion to a wood-based liquid heating fuel helped it eliminate campus emissions.
A recent report says low-polluting biofuels and reducing vehicle miles traveled will need to play a role.