On September 13, 2011, I began the endeavor of writing Miller Starr Regalia’s CEQA Developments blog. Ten years and 358 blog posts later, it continues to be a challenging and rewarding task. Since my inaugural post (which can be viewed here) was a “top ten” list of CEQA litigation mistakes to avoid, I thought an appropriate tenth anniversary post might be a list of the ten most significant CEQA case law developments over the past decade. My “top ten” list is definitely subjective, is limited to Supreme Court decisions, and (by its very nature) fails to include many important judicial developments. Nonetheless, here it is (with the decisions listed in no particular order):