The effects would definitely be felt by everyone if the global population were on its way to be halved. Also knock-on effects like mass emigration putting additional pressure on an already difficult political landscape. Potential for many more wars; more unknown unknowns etc.

Edit: the report’s "Extreme" severity band is indeed not a forecast but they’re basically saying "the chance of this happening is way too high".

> effects would definitely be felt by everyone if the global population were on its way to be halved

Many effects would hurt most people. But some would also be profited from. It’s incredible–as in debilitating to one’s credibility-to claim that everyone would suffer in the extreme case.

The rich, and I say this broadly to include the rich countries, will probably be fine. Poorer, yes, but not uniformly. Plenty of plenty of places and people would see booms from the new weather patterns, coasts and social fault lines.