Leonardo DiCaprio and President Obama talk climate change (20 images)

U.S. President Barack Obama, Leonardo DiCaprio and Dr. Katharine Hayhoe arrive for a discussion about climate change as part of the White House South by South Lawn event, in the South Lawn of the White House in Washington DC on October 3, 2016. Pool Photo by Aude Guerrucci/UPI

Leonardo DiCaprio participates U.S. President Barack Obama and Dr. Katharine Hayhoe in a discussion about climate change as part of the White House South by South Lawn event, in the South Lawn of the White House in Washington DC, on October 3, 2016. Pool photo by Aude Guerrucci/UPI

Guests watch US President Barack Obama, Leonardo DiCaprio and Dr. Katharine Hayhoe at a panel discussion on climate change as part of the White House South by South Lawn event, in the South Lawn of the White House in Washington DC, on October 3, 2016. Pool photo by Aude Guerrucci/UPI

U.S. President Barack Obama, Leonardo DiCaprio and Dr. Katharine Hayhoe discuss climate change as part of the White House South by South Lawn event, in the South Lawn of the White House in Washington DC, on October 3, 2016. Pool photo by Aude Guerrucci/UPI