“In August 2022, China faced a crippling heat wave that disrupted factories and threatened crop yields — the worst since 1961. Global manufacturers, including Volkswagen and Toyota, were among the companies that suspended operations because of power shortfalls. And some drought-stricken parts of the country are still engulfed by the scorching heat.”

https://www.supplychainbrain.com/articles/36234-chinas-heat-wave-is-the-biggest-supply-chain-disruption-of-the-year-so-whats-the-solution

Drought also left the Mississippi River so low near Memphis in the fall that barges couldn’t get through without additional dredging and upstream water releases. That snarled grain shipping during the critical harvest period. Colorado River officials discussed even tighter water use restrictions as water levels neared dangerously low levels in the major reservoirs.

In Europe, heat waves set record temperatures in Britain and other parts of the continent, leading to severe droughts, low river flow to the River Rhine threatened 30% of shipping, and wildfires in many parts of the continent.

This is affecting crops all over the world, and there is a threshold at which the Colorado river won’t have enough water to supply California, where most of America’s crops are grown, as well as other states:

https://www.msn.com/en-us/news/us/the-colorado-river-is-the-lifeblood-of-the-west-how-much-longer-will-it-last/ar-AA15t0IY

So yea, it is happening in our lifetime.