The world needs $700bn a year to restore nature. But where is the money coming from?

Representatives from nearly 200 countries at the UN's Cop16 summit in Colombia have yet to break the deadlock over who pays and how much

Experts agree that the world needs $700bn (539bn) a year to restore nature - but no one knows where the money is going to come from, and anger is building about rich countries failing to pay their share.

With representatives of nearly 200 countries gathered in Colombia for the UN Cop16 biodiversity summit, the question of who will fund conservation and how those funds will be distributed is a key battleground - and as negotiations push into their second week, frustration is growing at the lack of movement.