In the spirit of our “Green Gridirons” series (but just in case college football wasn’t your thing), the “Big Ten’s Eco Efforts” series highlights creative off-the-field sustainability efforts. In order to create a “living building,” Purdue University needed a small building with an apartment and classroom for an ecologist-in-residence. They wanted to build it to the standards of the Living Building Challenge, said Michael Gulich, director of sustainability at the school. The Living Building Challenge requires 20 prerequisites for certification, said Gulich. The requirements include net zero energy, which means producing as much energy as it consumes; net zero water, which requires a person’s water use to only come from collected precipitation or reused, purified water; an area for agriculture and an education component explaining how the site was built and how it functions.