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Scientists funded by the National Science Foundation (NSF) and affiliated with the Scripps Institution of Oceanography at the University of California, San Diego, report evidence of pronounced changes in the earth's climate that can be tracked in cycles of ocean conditions over thousands of years. These cycles reveal that the earth is currently in a period in which a natural rise in global temperatures, combined with warming from the greenhouse effect, will push the planet through an era of rapid global warming.
Charles Keeling and Timothy Whorf reported in the 21 March online edition of the Proceedings of the National Academy of Sciences that strong oceanic tides are the engines behind this warming-cooling cycle. Their report is the first comprehensive study of...