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Environmentalist and author Bill McKibben will give a presentation at 3 p.m. on Saturday, May 17, on the main stage of Western Washington University’s Performing Arts Center.
His presentation, which is part of ��������’s Western Reads program, is titled “350: The Most Important Number in the World,” in reference to leading climatologists’ estimate of the amount of carbon dioxide in the earth’s atmosphere (in parts per million) that represents a “tipping point” to future calamity.