Gov. Jerry Brown shows a paper during a workshop on climate change at the Casina Pio IV at the Vatican on Nov.4, 2017.
Gov. Jerry Brown shows a paper during a workshop on climate change at the Casina Pio IV at the Vatican on Nov.4, 2017. Alessandra Tarantino The Associated Press
Gov. Jerry Brown shows a paper during a workshop on climate change at the Casina Pio IV at the Vatican on Nov.4, 2017. Alessandra Tarantino The Associated Press