WHEN: Thursday, April 21, 8:30 a.m. to 2 p.m. WHERE: University Memorial Center. Free open to CU-Boulder students, faculty and staff http://www.colorado.edu/ecenter/css. The 22nd annual campus sustainability summit takes a forward-looking and interactive approach in 2016. Join a collaborative community-based process to crowd-source sustainability solutions. Register by April 15 here.