Understanding Earth's Deep Past: Lessons for Our Climate Future

摘要

Levels of carbon dioxide (CO_2) in the Earth's atmo sphere have grown so rapidly that they have already outpaced the projections of a decade ago. Without a reduction in greenhouse gas (GHG) emissions, CO_2 concentrations may increase to levels not experienced in more than 30 million years. A National Research Council study examines rocks and sediments from Earth's deep past for clues about the influence of high GHG levels on the climate of the future.