Bloomberg, Cooper and von Furstenberg enjoy penultimate day of Sun Valley 'billionaire summer camp'
Bill Gates on Friday told his fellow billionaires that more needed to be done to combat during an address at the annual Sun Valley conference in . With many of his fellow captains of industry, entertainment and technology having flown in by private jet, Gates told them the problem was real. The busy private jet traffic on Tuesday saw the U.S. Federal Aviation Administration bring in restrictions on air traffic control, temporarily banning other planes from the country's West Coast to as far as Michigan and Canada from departing. Gates has in the past defended his use of private jets, insisting he took steps to mitigate their damage. While promoting his book How to Avoid a Climate Disaster in February, Gates said: 'I am offsetting my carbon emissions by buying clean aviation fuel and funding carbon capture and funding low cost housing projects to use electricity instead of natural gas and so I have been able to eliminate it and it was amazing to me how expensive that was, that cost to be green... we've got to drive that down.' Gates, 65, attended the 37th annual gathering without his estranged wife Melinda, following their May divorce announcement. On Thursday he was seen strolling the grounds of the Idaho resort with Evan Greenberg, president and CEO of insurance giant Chubb. The pair were spotted near where he and other titans of tech, media and industry gathered for lunch on Thursday - among them Facebook founder , Apple CEO Tim Cook, Nike co-founder Phil Knight, and Amazon CEO Jeff Bezos. Bezos was spotted on Thursday evening laughing happily beside girlfriend Lauren Sanchez, having relinquished the reins of Amazon three days earlier. Bezos is no longer CEO - a role now taken by Andy Jassy - and instead is chairman of the company. On July 20 Bezos will jet into space for an 11 minute ride with his company, Blue Origin. His British rival in the space race, Sir Richard Branson, has announced he is going into space on July 11 - beating Bezos by 11 days. Branson has not been spotted at the Sun Valley conference and is believed to be in the midst of final preparations for the historic journey. On Friday afternoon, the group participated in another session focused on leadership during troubled times, according to a schedule obtained by . Among the attendees are CIA director Bill Burns, and his predecessor David Petraeus, who ran the agency from September 2011 for a year. Michael Bloomberg, the former mayor of New York and presidential candidate, is also in attendance this year. On Saturday, James Baker III, former secretary of state, will interview Berkshire Hathaway chief Warren Buffett for the traditional closing session with the Oracle of Omaha. Buffett, 90, on Wednesday saw his stake in Apple jump in value to $128billion, thanks to the iPhone maker's stock price closing at a record high. The investor has more than tripled his money on Apple in the past three years - but he would have quadrupled it if he didn't sell a chunk of the holding. Variety reported that sessions at the conference, which began on Tuesday and runs until Saturday were held outdoors. On Wednesday the conference kicked off with a presentation on e-commerce by Shopify by CEO Tobias Lutke, and a general discussion of the global economic climate. A session on criminal justice reform was also on the agenda, as was immigration reform. On Thursday, Allen & Co. regulars Barry Diller and his wife, fashion designer Diane von Furstenberg, held a session on creativity. Diller - a Hollywood icon who was the former CEO of both Paramount and what was 20th Century Fox, which is now part of Disney - said streaming services killed the film industry. 'The movie business is over,' said Diller, 79, in an exclusive interview with on the sidelines of the conference on Friday. 'The movie business as it was before is finished and will never come back. 'The definition of movie is in such transition it doesn't mean anything anymore.' Movie-making has become less of an art form and more of a factory-like production pushing quantity over quality to supplement other services, Diller said. Von Furstenberg has put on a typically stylishly display over the course of the week - although she has been regularly upstaged by Alice + Olivia co-founder Stacey Bendet, whose colorful and flamboyant ensembles made a welcome change from the polo shirts, chinos, and Mark Zuckerberg's $35 Adidas slides. Media moguls in attendance included Netflix co-CEOs Reed Hastings and Ted Sarandos, ViacomCBS chair Shari Redstone, Disney chairman Bob Iger and WarnerMedia CEO Jason Kilar. Discovery CEO David Zaslav was spotted at the resort, as well as CNN anchor Anderson Cooper, CBS presenter Gayle King, actress Candice Bergen and film and television producer Brian Grazer. Jennifer Witz, the CEO of SiriusXM, was also spotted. The world of sports was represented by Robert Kraft, chief executive officer of the New England Patriots. From the world of finance, Mala Gaonkar, co portfolio-manager of Lone Pine Capital, was seen with heavily-noted papers; Ted Weschler, investment manager at Berkshire Hathaway was spotted talking to Meg Lawler, director of the annual event; while Mike Speiser, a managing partner at venture capital firm Sutter Hill Ventures, was also in attendance. Israeli-American venture capitalist Vivi Nero was spotted on Friday, as was Gates' money manager, Michael Larson. David Velez, CEO of Nubank, was also in attendance. Richard Reeves, a British economist at the Brookings Institute, was also present, as was David Weinberg, chairman of the Coca-Cola Company. In healthcare, Amy Vogel, of blood purification company CytoSorbents Corporation, was seen on Friday, as was Erica Hauver, an expert on Keto Nutrition Therapy and chronic disease reversal. From the legal world, Mike Keating of Foley Hoag was represented.