DURHAM, N.H. (AP) – Landfill gas powered the loudspeakers and leftover food will be turned into compost as the University of New Hampshire celebrated commencement, and its efforts to be green.

The school is the first university in the nation to receive most of its heat and electricity from landfill gas, and it showcased the achievement as part of an eco-themed graduation ceremony on Saturday.

Stonyfield Farm CEO Gary Hirshberg, who has been an outspoken business leader on sustainability issues, was commencement speaker. He urged the 2,200 graduates to be determined and to take risks, noting the future facing most of them is the same one he faced when he started in business 26 years ago: broke, clueless about the future and in debt.