UN chief says world is on ‘highway to climate hell’ as planet endures 12 straight months of unprecedented heat CNNUN says global temperatures likely will surpass target limit by 2028 The Associated PressWorld likely to blast beyond grim warming milestone in the next 5 years, UN weather agency says CNBCWorld hits streak of record temperatures as UN warns of ‘climate hell’ Reuters‘Hanging by a Thread’: U.N. Chief Warns of Missing a Key Climate Target The New York Times