Comparing greenhouse gas emissions from global oils that vary widely due to their composition and management.
Cautious, deliberate guidelines based on up-to-date data and information are needed to manage the increasingly diverse assortment of unconventional oils.
Significant policy, climate, and economic challenges face the use of unconventional oil as a new energy resource.
With a shift from the production of conventional oil to unconventional oil, the world is at a key moment to determine the future energy balance between oil and low-carbon alternative fuels.
The real issue behind the Keystone XL pipeline debate is how to manage the climate effects of the shift from conventional oils to unconventional oils.
Despite expert warnings, global policymaking communities lack a comprehensive understanding of the changing composition of their oil supplies and their impact on the climate.
Given that on-road transportation has the greatest negative effect on the climate compared to all other economic sectors, cutting air-pollutant emissions from this form of transportation would be good both for the climate and for public health.