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Brook is an assistant professor of geology and environmental science at WSU Vancouver, and Blunier is a visiting research fellow in the department of geosciences at Princeton University. Examining ice core samples and methane gas measurements, Brook and Blunier show that when Antarctica temperatures decreased, temperatures in Greenland generally increased, and when temperatures in Antarctica increased, temperatures in Greenland decreased. The research precisely compares the timing of rapid shifts in climate over the past 100,000 years in Greenland and Antarctica, showing that rapid warming in the Northern Hemisphere coincided with rapid cooling in the Southern Hemisphere. Brook has studied the chemical composition of ice cores for the last eight years, traveling to Greenland and Antarctica twice. The amount of methane, carbon dioxide and nitrous oxide in air trapped in ice cores shows the history of global climate change.