"If you plot their metabolic rate against their mass on a log-log graph, you get an absolutely straight line" Anything in a log-log plot is a straight line! "

"If you plot their metabolic rate against their mass on a log-log graph, you get an absolutely straight line" Anything in a log-log plot is a straight line! "Currently [cities] are growing exponentially. Every week from now until 2050, one million new people are being added to our cities." That's linear, not exponential.