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Robert Redford, actor, listens during a news conference at the United Nations COP21 climate summit at Le Bourget in Paris, France, on Friday, Dec. 4, 2015. France's Energy and Environment Minister Segolene Royal yesterday said the fate of the United Nations global warming talks hinges on the willingness of richer countries to pay poorer ones more for climate-related projects. Photographer: Christophe Morin/Bloomberg via Getty Images

Robert Redford, actor, listens during a news conference at the United Nations COP21 climate summit at Le Bourget in Paris, France, on Friday, Dec. 4, 2015. France's Energy and Environment Minister Segolene Royal yesterday said the fate of the United Nations global warming talks hinges on the willingness of richer countries to pay poorer ones more for climate-related projects. Photographer: Christophe Morin/Bloomberg via Getty Images

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LOS ANGELES, CA - DECEMBER 09: Actor Robert Redford speaks onstage during the 24th annual Women in Entertainment Breakfast hosted by The Hollywood Reporter at Milk Studios on December 9, 2015 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images for The Hollywood Reporter)

LOS ANGELES, CA - DECEMBER 09: Actor Robert Redford speaks onstage during the 24th annual Women in Entertainment Breakfast hosted by The Hollywood Reporter at Milk Studios on December 9, 2015 in Los Angeles, California.  (Photo by Frazer Harrison/Getty Images for The Hollywood Reporter)

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NEW YORK, NY - NOVEMBER 30: Actor Robert Redford attends the 25th Annual Gotham Independent Film Awards at Cipriani Wall Street on November 30, 2015 in New York City. (Photo by Theo Wargo/Getty Images)

NEW YORK, NY - NOVEMBER 30:  Actor Robert Redford attends the 25th Annual Gotham Independent Film Awards at Cipriani Wall Street on November 30, 2015 in New York City.  (Photo by Theo Wargo/Getty Images)

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PARK CITY, UT - JANUARY 22: Sundance Institute President Robert Redford during the Day One Press Conference for 2015 Sundance Film Festival on January 22, 2015 in Park City, Utah. (Photo by George Pimentel/Getty Images for Sundance)

PARK CITY, UT - JANUARY 22:  Sundance Institute President Robert Redford during the Day One Press Conference for 2015 Sundance Film Festival on January 22, 2015 in Park City, Utah.  (Photo by George Pimentel/Getty Images for Sundance)

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NEW YORK, NY - OCTOBER 08: Actor Robert Redford attends the "All Is Lost" premiere during the 51st New York Film Festival at Alice Tully Hall at Lincoln Center on October 8, 2013 in New York City. (Photo by Jemal Countess/Getty Images)

NEW YORK, NY - OCTOBER 08:  Actor Robert Redford attends the "All Is Lost" premiere during the 51st New York Film Festival at Alice Tully Hall at Lincoln Center on October 8, 2013 in New York City.  (Photo by Jemal Countess/Getty Images)