Trees, targets and trillions: what's on the agenda at COP30?

The marathon negotiations gather nearly every country to confront a challenge that affects them all but unlike recent editions, this "COP" has no single theme or objective. That does not mean big polluters will get off easily at COP30 in Brazil, with climate-vulnerable nations frustrated at their level of ambition and financial assistance to those most affected by a warming planet. Here are the big issues to look for as world leaders gather in the city of Belem on Thursday and Friday before the start of formal negotiations the following week...