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"Fuzzy Math" with Non-Renewable Resources
An op-ed piece in the New York Times (article text here) described the exponential decline of our non-renewable resources.
Just for fun, type the number of years the supply would last at the current rate of consumption in the first line below. Then type in the expected increase in consumption per year as a percentage in the second line. Hit the submit button to find out how many years that really gives us.