An exponential curve is a graph that shows rapid and continuous growth or decline, where the rate of increase or decrease gets bigger and bigger over time. It often starts slowly, but then speeds up dramatically later on. Full definition
During the 20th century, atmospheric CO2 levels followed a rough exponential curve, therefore, it would not be unreasonable to expect a linear response. (realclimate.org)
As you can see, it's a nice exponential curve with an impressive growth rate. (treehugger.com)
Technologies are advancing on exponential curves and becoming faster and cheaper — so every country can afford them. (fortune.com)