Earth System Tipping Points

Map of potential policy-relevant tipping elements in the Earth’s climate system overlain on population density. Question marks indicate systems whose status as tipping elements is particularly uncertain.
Source: University of East Anglia
URL:     http://yosemite.epa.gov/ee/epa/eerm.nsf/vwAN/EE-0564-112.pdf/$file/EE-0564-112.pdf