At present, atmospheric carbon dioxide levels are roughly 390 parts per million (ppm). Proceedings of the National Academy of Sciences (NAS), as reported earlier this year in the Los Angeles Times, stated that even if the nations of the world could bring carbon dioxide levels back to those of the pre-industrial era -- a fantasy miracle we aren't going to see -- it would still take 1,000 years or longer for the climate changes already triggered to be reversed. According to the NAS, this is primarily due to the long-term impact of carbon dioxide on oceans. The NAS further reported that in the nearer future the world will experience greater melting of the polar ice caps than previously estimated and droughts in some regions, including southwestern U.S., comparable to the 1930s U.S. Dustbowl.
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