A $100 billion dividing line between the world’s richest and poorest countries threatens to undermine any hope for a grand deal at the COP26 climate negotiations. That’s the amount in annual contributions promised more than a decade ago by developed nations to help less well-off nations cut planet-warming emissions and adapt to climate change. It’s one-half of a quid pro quo agreed in 2015 at United Nations-sponsored talks in Paris: Developed countries put up the cash, and in return poor countries invest in clean-energy technologies and resiliency projects such as flood defenses. Ahead of the next global summit, held in Glasgow, Scotland, advanced economies have come up short. The gigantic financial gap has some of the worst greenhouse gas […]