TODAY 8a: Bill Gates on global warming. Kristen Stewart on playing Princess Diana in “Spencer.” Ed Sheeran on fatherhood, new album and upcoming SNL performance.

<p>For our “TODAY Climate” series, Bill Gates speaks with Anne Thompson at the UN Climate Conference in Scotland and says Washington needs to show leadership in the fight against global warming. Plus, Kristen Stewart is in Studio 1A to talk with Savannah Guthrie and Hoda Kotb about taking on the role of Princess Diana in “Spencer,” Oscar buzz and her big engagement news! Also ahead, Ed Sheeran chats with Savannah and Carson Daly about his new album, fatherhood, and prepping to perform on SNL this weekend.</p>