A supermajority is usually described as a 2-1 majority, where the majority is twice as big as the minority.
A poll this month in America resulted in 70% of respondents saying that the US government should do more to combat global warming.
52% of respondents said that the issue of global warming is either extremely important or very important to them personally.
20% want higher taxes on electricity prices to reduce demand (79% don't)
32% want higher taxes on petrol to reduce demand (67% don't)
86% want the government to regulate or encourage development of cars that use less petrol.
78% want the government to regulate or encourage development of appliances that use less electricity.
88% want the government to regulate or encourage ways of reducing greenhouse gas emissions from power plants.
59% of respondents think the Democrats are best suited to handling global warming issues.
19% of respondents think George W. Bush is best suited to handling global warming issues.
58% of respondents are concerned about sea-level rises as a result of global warming.