The United States has been waging a war on international terrorism for more than four years, but what does Al Gore think is a more serious issue?
Global warming.
In in interview with Australia's The Age, the 2000 Democratic presidential nominee and former senator drew parallels between those who dispute global warming, and its investment implications, with Neville Chamberlain and others who wanted to appease the Nazis before World War II.
Winston Churchill warned in the 1930s that a storm was gathering and democratic nations would be forced to "sip from the bitter cup" until they reasserted their moral authority.
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"The time of half-measure has passed. We are entering a period of consequences," says Gore, quoting Churchill.
"What changed in the U.S. with Hurricane Katrina was a feeling that we have entered a period of consequences and that bitter cup will be offered to us again and again until we exert our moral authority and respond appropriately," he says. "I don't want to diminish the threat of terrorism at all, it is extremely serious, but on a long-term global basis, global warming is the most serious problem we are facing."
Gore is the co-founder and chairman of the British-based sustainable investing company Generation Investment.