The following graph shows the annual mean carbon dioxide concentration, in parts per million (ppm), every 5 years from 1990 through 2050. (The world governments finally got their acts together and implemented aggressive measures in 2020 to reverse global warming. $t=0$ represents 1990.)
* Figures are rounded and based on the planet's characteristics as documented in, say, wikipedia.org.
Average rate of change of $C$ over $[%0,%1] =$ BOX
(Answer should be be expressed as an exact fraction.)
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