Projected Adverse Impacts On Human Systems
q A general reduction, with some variation, in potential crop
yields in most regions in mid-latitudes for increases in annual-
average temperature of more than a few °C.
q Decreased water availability for populations in many water-
scarce regions, particularly in the sub-tropics.
q An increase in the number of people exposed to vectorborne
(e.g., malaria) and water-borne diseases (e.g., cholera), and an
increase in heat stress mortality.
q A widespread increase in the risk of flooding for many human
settlements (tens of millions of inhabitants in settlements
studied) from both increased heavy precipitation events and sea-
level rise.
q Increased energy demand for space cooling due to higher
summer temperatures.