The Dubai-hosted COP28, the first annual UN climate summit to be held in the Gulf, saw almost 84,000 people attend. By comparison, COP30 in Brazil will have a much smaller participation, with only about 12,200 people having signed up as of Oct. 8, according to preliminary data from the UN. This will not be the only key difference between COP30, which starts on Monday, and many of its predecessors.

The Dubai-hosted COP28, the first annual UN climate summit to be held in the Gulf, saw almost 84,000 people attend. By comparison, COP30 in Brazil will have a much smaller…

Delegates from around the world are expected to disagree over how to tackle climate change and who should pay.