Shortages of safe drinking water and disruption to vaccination programmes are increasing the risks.
But global warming is the murkiest of the factors increasing the risks there.
And regulatory authorities, especially the F.D.A., have become extremely risk-averse, increasing the risks of research dramatically.
"This standoff between Greece and the eurozone is increasing the risks every day to the British economy.
The accumulation of CO2 in the atmosphere also drives the warming of the oceans, increasing the risks of coral bleaching.
Mr. Greenspan said the United States was "pursuing a policy of currency weakening" and increasing the risks of trade protectionism.
Elected officials fear primaries as much or more than general elections, increasing the risks of defying orthodoxy.
But to weaken the dollar, actively or through neglect, would mean increasing the risks of inflation, as prices of imported goods rose.
"They go right down into the lungs and can pass through the membrane into the bloodstream", increasing the risks of strokes and heart attacks.
"There has been a rise of conflicts since the transnational mining company entered the area, significantly increasing the risks faced by community leaders," he said.
"What happens when income falls short is that people start increasing the risks they take to keep up their spending," Ms. Warren said.
