The battle to keep global warming within 1.5 degrees Celsius has been a rallying cry for climate action for nearly a decade. Now, with the planet almost certain to blow past the target, diplomats and campaigners at the COP29 summit have found themselves awkwardly clinging to a goal that no longer makes sense. The evidence has become harder and harder to ignore. This year will once again be the hottest on record as greenhouse gas emissions continue to soar and Earth will likely register an average reading of 1.5C above pre-industrial levels for the first time. A study released this month using a new technique for measuring the rise in temperatures suggests the world was already 1.49C hotter at the end of 2023. …The mood in Baku has not been hopeful. Leaders from most major economies, consumed by domestic political struggles, failed to turn up. 

Related coverage in the NY Times: At COP29, Climate ‘Optimism Has Been Dampened’