EVI: 20 Years of Lessons Learned September 9, 2015 - Download Version 1.0.0 Download 1394 File Size 924.47 KB File Count 1 Create Date September 9, 2015 Last Updated September 10, 2015 EVI: 20 Years of Lessons Learned by EVI Executive Director Liz Walker. Overview of experiences and lessons learned in creating the ecovillage over the past 20 years. This was written as part of an EPA "Climate Showcases" grant.