| http://www.w3.org/ns/prov#value | - In 2004, they said that global warming had at least doubled the risks of such unusual heat.The new statistical reviews are difficult because they have to tease out the impact of greenhouse gases from natural variations, such as periodic El Nino warmings of the Pacific, sun-dimming volcanic dust or shifts in the sun's output.So far, extreme heat is the easiest to link to global warming after a rese
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