Fortunately, the longest presentation at the Ethanol Summit was one of the most interesting. Will Steger narrated a slide show of his various expeditions across frozen ice lands in Antarctica, the North Pole and the Greenland ice cap. He spoke of temperatures 30 degrees below freezing with 30 mile an hour winds. But, amidst all that freezing cold Will said he witnessed evidence that suggests the reality of global warming. Will said significant climate changes are causing large remnants of ice from the last ice age to break up and begin to melt. He said one ice shelf took him 21 days to cross and in 2002 the entire shelf disintegrated in just a matter of four weeks, and another ice shelf was completely gone a night after he crossed it. Will said these are real affects of global warming – a global warming he says the human population is contributing to and altering. For Will, the diminishing summer sea ice suggests the earth is experiencing what he calls “unnatural climate changes.”