Oregon Field Guide will include a story about the City of Portland's ecoroof program and research at Oregon State University. The episode will air on Thursday, Feb. 18 at 8:30pm. It will be available at the same time on the web at http://www.opb.org/programs/ofg/episodes/view/2110. The show will also re-air on Sunday, Feb. 21 at 6:30pm.

Oregon Field Guide is a production of Oregon Public Broadcasting. Check here for channel listings in your area.