"AI holds immense potential to advance human well-being, yet its current trajectory presents unprecedented dangers," the letter read. AI red lines would be internationally agreed bans on uses deemed too risky under any circumstances, according to creators of the letter. Examples given included entrusting AI systems with command of nuclear arsenals or any kind of lethal autonomous weapons system. Other red lines could be allowing AI to be used for mass surveillance, social scoring, cyberattacks, or impersonating people, according to those behind the campaign. Those who signed the message urged governments to have AI red lines in place by the end of next year given the pace the technology is advancing.