Washington: Global momentum is building on the climate crisis but action will be impossible without two nations, China and the United States, which together account for more than half of emissions — and whose governments don’t get along.

Ahead of the COP26 summit in Glasgow, experts believe that breakthrough US-China cooperation could be the catalyst for a historic agreement on climate change — but also that frosty ties between Washington and Beijing are not, so to speak, the end of the world.…