OSU's grade has improved each of the past three years, from a D+ to a B-.
Stephen McKeever, vice president for research and technology transfer, said the university has been taking a variety of steps to improve sustainability efforts and curb energy consumption. Initiatives include starting a farmer's market and encouraging students to use reusable cups at dining locations on campus. Sustainability coincides with OSU's land-grant mission, McKeever said.
This year marks the second consecutive year OU and Tulsa earned Cs on the report card.
In an e-mail statement, David Hamby, director of university relations at Tulsa, said the university strives to operate in a way that will help preserve resources for future generations. Any new construction work, including selection of materials and design, is done with a consideration for energy conservation, Hamby said.
Tulsa's grade had improved each year until this year. OU's grade dropped slightly from a C+ two years ago.