Countries at the COP29 summit tried to make progress on how to raise up to $1 trillion in climate finance for the world's most vulnerable, as political tensions overshadowed the talks and Argentina on Thursday pulled its delegation from Baku.

As we approach the halfway mark of the UN Climate Change Conference or COP29 in Azerbaijan, a group of former leaders and climate experts has published a critical open letter highlighting what has so far been a fractious summit that has made little progress.

The next major United Nations meeting on climate change, known as COP29, is about to get underway in Baku, Azerbaijan. These annual meetings are the key international summits as the world attempts to address the unfolding climate crisis.