While Elon Musk and Bill Gates have debated the threat of artificial intelligence, and the risk of World War III, Google executive and futurist Ray Kurzweil said Friday that he’s optimistic the world will survive AI’s rise – though leaving open the possibility of some “difficult episodes.”

“World War II – 50 million people died, and that was certainly exacerbated by the power of technology at that time,” Kurzweil, a graduate of MIT known for his bold predictions on technology, said at the Council on Foreign Relations.

Musk, the CEO of Tesla and SpaceX, tweeted in September that the race for superior AI technology will bring about World War III, which mirrored comments from Russian President Vladimir Putin, who has said that whoever harnesses the greatest technology will “become the ruler of the world.” Microsoft co-founder Gates has disagreed with Musk, arguing that AI will make humans more productive and creative.

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