WASHINGTON (TNND) — Warnings about the dangers of artificial intelligence are no longer coming only from critics outside the tech industry. Some of the people building the most advanced systems are now urging the world to slow down.Tristan Harris, former Google employee and co-founder of the Center for Humane Technology, told The National News Desk the concern inside the industry has grown to the point that “1,300 employees from the labs, from the top AI labs, signed a letter saying we need to slow down frontier development.” (TNND)In the past two weeks, leaders at Anthropic, OpenAI, xAI and Google DeepMind…