I'm sure it was all that industrialization and SUVs that caused the previous observations...or NOT. Variation is normal. It happens without human influence. Turning the current civilization into a 3rd world mess is not necessary or helpful. The climate will vary anyway.
Cheby SUV sales in Cancun in 750 AD were something fierce ~ leading directly to the great drought that destroyed the Maya.
Only now are Cheby sales resuming and fingers are crossed!