One of the most sensitive areas to CC is viniculture. Most vineyards can't migrate north for geographic or soil type reasons. Chablis for example is on a spot of a certain kind of chalk not present to its north. At best, they might change varietals to a warmer weather tolerant type, chardonnay depends on cool nights. Or they just produce what they have with a gradual change in flavor. But that is one canary in this coal mine.
I've seen talks about this, but as yet nothing of consequence has happened.