The number of people burning wood and oil has increased during that time, the total volume of CO2 released by human activity has steadily increased since the industrial revolution.
If you look at the charts again you'll see the temp. has been rising more and more in response since the industrial revolution.
As a peer comment noted, you can ignore the 0 degree line, the article uses two different epoch markers, these are just arbitary convention.
If you look at the charts again you'll see the temp. has been rising more and more in response since the industrial revolution.
As a peer comment noted, you can ignore the 0 degree line, the article uses two different epoch markers, these are just arbitary convention.