USPTO Green Technology Pilot Program
The U.S. Patent and Trademark Office's Green Technology Pilot Program has been expanded and extended. Applicants can accelerate examination of unexamined US patent applications pertaining to environmental quality, energy conservation, development of renewable energy resources or greenhouse gas emission reduction.
Similar to the Patent Prosecution Highway fast track program, there isn't a petition fee or burdensome requirements. The average time before the first action on a “green technology” application is 49 days.

The pilot program will run through the end of 2011 or until 3000 petitions are granted. 1595 petitions have been granted already.