In face of ongoing threats to its environment, California has taken big steps to protect its nature and wildlife. Professor David Vogel lays out California's history as an environmental leader, how it plans to continue its green streak, and what other states - and the federal government - can learn from California's policy innovation.

• Read Vogel's SSN Brief, How Environmental Policies Can Promote Economic Growth
• Check out his book, California Greenin': How the Golden State Became an Environmental Leader
• Find his LA Times op-ed, The Trump administration wants to end California's role as an environmental innovator and his interview with Bloomberg, Why California Goes Its Own Way on the Environment