So this is an interesting chain of cause and effect: global warming kills the CA avocado crop, driving up global prices, forcing others to destroy carbon sinks, which in turn contributes to more global warming. I wonder how many more of these feedback loops exist, and how long they get.

I can think of another:

increased atmospheric CO2 ->

ocean acidification->

reduced seafood yield->

increased food prices->

more pressure to convert land to agricultural use->

increased CO2 from agricultural output, fuel consumption, and removal of carbon sinks.

The first two (3?) are already happening.

BTW, the water supply in Mexico is already in real trouble from saltwater incursion and benzine contamination.