Gov. Jerry Brown, right, delivers a speech on climate change in the Casina Pio IV at the Vatican, Wednesday, July 22, 2015.
Gov. Jerry Brown, right, delivers a speech on climate change in the Casina Pio IV at the Vatican, Wednesday, July 22, 2015. Alessandra Tarantino AP
Gov. Jerry Brown, right, delivers a speech on climate change in the Casina Pio IV at the Vatican, Wednesday, July 22, 2015. Alessandra Tarantino AP