What do you think the graph would look like if factories and motor vehicles did not burn fossil fuel and produce carbon dioxide's?

Almost identical to what Vostok look like today. Man only produces about 3% of all CO2 and much of that from sources that would occur naturally in any event.

To get a better idea of what CO2 graphs have looked like historically, check out the Vostok site. There you will see that CO2 has always followed temperature by about 800 years. The current warming cycle started about 10,200 years ago, so we would expect to see CO2 levels rise that past 9,600 years, just like they have.

A:The look of the graph would depend on how long they had been using renewable energy (solar, wind, water, etc) but we would hope to see that the steady rising trend on the temperature graph was stopping and even beginning to come down. The earth's temperature has been rising steadily since we started burning fossil fuels (coal, oil and natural gas) 250 years ago, and it has been rising even more rapidly since 1980. Carbon dioxide can remain in the atmosphere for close to 100 years, so we hope that these factories and cars have made the change to renewable energy long before.