Ask someone who's been a wine geek since before MTV was a channel. Global warming is real.

Bordeaux, Rhones, and Piemonte reds, on average, are 1%-1.5% higher in alcohol than they were in the 60s and 70s.  And that, along with the trend toward more "international"-style winemaking, makes them less interesting.  On the plus side, red Loire wines are better than they used to be,  More frequently than not in the old days, they were unripe and sucked.  Now, much better.

That is all.