While North­eastern University’s school colors may be red and black, it has once again been hon­ored for being “green.”

North­eastern is among the insti­tu­tions rec­og­nized in “The Princeton Review’s Guide to 311 Green Col­leges: 2011 Edi­tion,” which high­lights the nation’s most envi­ron­men­tally respon­sible “green col­leges.” The guide, in its second year, lists 308 insti­tu­tions in the United States and three more in Canada that “demon­strate notable com­mit­ments to sus­tain­ability in their aca­d­emic offer­ings, campus infra­struc­ture, activ­i­ties and career preparation.”

The Princeton Review released the list in col­lab­o­ra­tion with the U.S. Green Building Council, known for devel­oping the LEED green building cer­ti­fi­ca­tion program.

The honor is the latest example of Northeastern’s com­mit­ment to sus­tain­ability, one of the University’s top research themes, along with secu­rity and health.

In 2007, the Uni­ver­sity became a founding member of the Amer­ican Col­lege & Uni­ver­sity Pres­i­dents Cli­mate Com­mit­ment, a nation­wide ini­tia­tive to neu­tralize green­house gas emis­sions among insti­tu­tions of higher learning. In 2010, North­eastern offi­cially adopted a cli­mate action strategy called “Sus­tain­able Action Plan: Roadmap towards Carbon Neutrality.”

In addi­tion, the Sus­tain­able Endow­ments Insti­tute, one of the most rig­orous asses­sors of sus­tain­ability prac­tices on col­lege cam­puses, last year awarded North­eastern one of the highest rat­ings in North America on its 2011 Col­lege Sus­tain­ability Report Card — an A-​​, which was the highest of any Boston-​​based uni­ver­sity. The report card also named North­eastern an Overall Col­lege Sus­tain­ability Leader, and, for the fourth-​​consecutive year, Campus Sus­tain­ability Leader.

Last year, North­eastern was also among 18 col­leges and uni­ver­si­ties selected to The Princeton Review “2011 Green Rating Honor Roll” for its out­standing com­mit­ment to campus sus­tain­ability through envi­ron­mental poli­cies, prac­tices, and aca­d­emic offerings.