Hops and barley are two must-have beer ingredients that don't respond well to global warming. In recent years, New Zealand has experienced poor barley harvests, and the Czech Republic is watching its prized hops lose potency with each passing season. Researchers from both countries say global warming as the likely culprit. Traditionally stable weather patterns are being disrupted, throwing the growing season out of wack. Beer isn't going away anytime soon, but someday a simple pint might be a lot more expensive if we mitigate the consequences of climate change.