The Winds of Change

changing climates favored bigger-brained, more adaptable hominidsclimate change more abrupt than originally thought
THC - thermohaline circulation - as water evaporates, it becomes saltier, therefore heavier, so it SINKS, pulling the current behind it. Happens ONLY in the North Atlantic (Gulf Stream)cycles exist from 100,000 years down to 20 years (El Nino) - we are at the intersection of lots of cycles
*Human activities both increase risk of severe climate change and minimize earth's ability to cope with such changes (deforestation, mangrove depletion, etc).

We're doomed.

(suggested reading - “Late Victorian Holocausts” by Mike Davis)