'Out of sync': The trillion-dollar climate puzzle that's become a diplomatic nightmare

As countries negotiate a new global goal to raise climate cash, these five charts show why discussions are so fraught.

A hundred billion dollars. It's a staggering amount of money, although there are in fact now 16 individuals with personal assets worth more than this amount. But at the ongoing UN climate talks it's also a highly loaded figure, especially for countries on the frontlines of climate change.

It's the threshold amount that, back during turbulent negotiations in 2009, rich countries promised to "mobilise" each year by 2020 to help the billions of people in developing countries transition to a greener economy and cope with the impacts of climate change. READ MORE from BBC