Key achievements at the COP28 UN climate change conference in Dubai included an agreement to transition away from fossil fuels. But on our current trajectory, can the world limit global warming to 1.5 degrees Celsius above pre-industrial levels, and what are the most urgent climate issues to be addressed in 2024? Former Deputy Special Envoy for Climate at the US State Department, Jonathan Pershing evaluates COP28 and the focus for COP29.