Comment Ask the Yakima (Score 1) 118
The Yakima tribe and some of the non-tribal people around them used to be major growers of hops. (It was one of the few crops the land there was suitable for.) Then a few decades back several major commercial brewers switched to something else instead of actual hops. Their market dried up and the area has only a little hops production now.
Beer made in the US using actual hops is mainly products of microbreweries these days.
Though hops grew especially well in the northern tiers of states there are beer-worthy cultivars of hops that grow just fine as far south as southern California and the levels of heating predicted for even most of the eco-disaster scenarios correspond to moving crops a couple hundred miles north or to fields at a couple hundred feet greater altitude.
So I'm not all that worried that U.S. beer-drinkers will not be able to find something tasty if the brewers will deign to produce it. British Isles I'm not familiar enough with: Maybe they'll have to import hops from somewhere in Europe.