We find out how a project designed to maximize the flavor in a pint of Guinness revolutionized the way statistics are used in climate science; learn about the link between gold-mining techniques and climate change; and discover how buckets provided an invaluable data bank on global temperature. A timely and intriguing take on an urgent issue, Climate Change by Numbers reveals why scientists are so certain they are right, where we have reached the limits of our knowledge, and what uncertainty really means.