Indigenous leaders have traveled down the Amazon River to COP30 in Belem to demand climate justice. Photo: EPA PHOTO

As COP30 opens for the more than 190 countries participating, it is unclear what exactly they will discuss during the two-week UN summit in Brazil's Amazon city of Belem.

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Also unclear is how they'll handle testy issues, such as a 2023 pledge to wean off polluting energy sources and demand for financing to make that happen.

But the biggest question mark was whether countries would aim to negotiate a final agreement – a hard sell in a year of fractious global politics

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