Human body temperature has reportedly decreased from 98.6 °F to 97.5 °F. If we warm everyone on the planet back up to 98.6 °F by heat transfer from the air (to reduce global warming), by how much could we cool down the atmosphere? (Thanks to Trevor Lipscombe at Catholic University of America and Carl Mungan at the U.S. Naval Academy for the question.)

How much toilet paper does the U.S. use in a year?

How much area would that cover?

Look for the answers online at under “Browse,” at the very end of the current issue.

Question suggestions are always welcome!

For more Fermi questions and answers, see Guesstimation 2.0: Solving Today’s Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012).

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