Abstract
Climate Change About 60 million years ago, carbon dioxide concentration in Earth's atmosphere rose sharply, resulting in severe climatic changes that may in some ways mirror Earth's future climate. In a Perspective, Alley explains that the consequences of these climatic changes were severe. Consequences included dwarfing of land mammals, ecosystem disruptions, ocean acidification, and loss of coral reefs. The carbon dioxide rise during the Paleocene-Eocene Thermal Maximum (PETM) occurred over a longer time scale than that caused by fossil fuel burning today, which gave ecosystems more time to adjust to climate changes. Thus, the consequences of current and future global warming may be even more severe than those seen in this distant mirror. Science , this issue p. [151][1] [1]: /lookup/doi/10.1126/science.aaf4837
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