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Thin Ice focuses on the exploits of Lonnie Thompson, the relentless visionary behind the high-altitude climatology movement, one of the most promising areas of global warming research. For 30 years, hes led expeditions to every blank on the map he could find, from the Andes to Kilimanjaro, to drill for ice cores, frozen time capsules that lock in air, dust, and pollution of climates past, and offer solid (literally) evidence of human impacts on the environment. Thompson has now spent more time in the death zone above 20,000 feet than almost anyone alive. Even his chief rival admits that Thompsons insistence that the real climatological action is atop glaciers, not at the poles, has earned him a place in the ranks of our great explorers.