Organizers are hoping this year's Conference of Parties — known as COP30 — will yield action to advance the many unmet promises laid out at previous such meetings. But the leaders of China, the United States and India will be notably absent from a gathering of heads of state over the next two days.

The Prince of Wales has criticised criminals involved in the deforestation in the Amazon rainforest, during a speech in Rio de Janeiro. William was speaking at the United for Wildlife conference on Tuesday as part of his royal visit to Brazil.