PLU has a long history of being committed to a sustainable campus and leading the way as an example for institutions around the world. A certification program in environmental studies was developed in the 1970s, and a major was established in the 1990s. On April 22, 2004 PLU President Loren Anderson signed the Talloires Declaration, making PLU the first Pacific Northwest University to sign the declaration. Leading the nation as a charter signatory to the American College and University presidents Climate Commitment in 2007, PLU accepted the challenge, showing commitment to achieving carbon neutrality. The agreement called for universities to reduce greenhouse gas emissions, but PLU has taken the initiative to set their goal of becoming carbon neutral by December 31, 2020. The 2015 edition of The Princeton Review's Guide to 353 Green Colleges recognized PLU as a green college leader. Highlights of the review include PLU dining services using 25 percent of its food budget to buy