More than 200 top economists, executives, and researchers — including over a dozen Nobel Prize winners — have signed an 88-word-long letter titled "We Must Act Now," warning that AI could become "radically more powerful" in the coming decade and arguing that policymakers worldwide need to do more to build guardrails or risk "large-scale job displacement." Signatories include former Google CEO Eric Schmidt, LinkedIn cofounder Reid Hoffman, Nobel laureates Joseph Stiglitz, Daron Acemoglu, and Simon Johnson, as well as Google AI lead Jeff Dean, Anthropic cofounder Jack Clark, and OpenAI finance boss Sarah Friar.