With deadly extreme weather hitting all over the globe, rising temperatures peaking during the hottest summer on record and carbon pollution levels that keep climbing, Britain’s Prince William and wealthy entrepreneurs Bill Gates and Michael Bloomberg promised a warming world a degree of hope.

Heads of state, finance leaders and activists from around the world will converge in Paris this week to seek ways to overhaul the world's development banks — like the International Monetary Fund and World Bank — and help them weather a warmer and stormier world.