CO2 is a minor greenhouse gas which has a complex, not-fully-understood interaction with the Earth's oceans and topsoil. To get an idea of how insignificant it is in the atmosphere, look at this graph:http://home.austarnet.com.au/yours/Water%20Vapour% ...CO2 promotes agriculture and forests (as plants breathe it), and as such it is beneficial to mankind.Cars do not emit most of the CO2 emitted by man - power plants do. Therefore, any effort to reduce CO2 must result in a reduction in the amount of power produced, causing higher energy prices. For details on the history of this type of fiasco:http://www.lewrockwell.com/orig10/berry-e1.1.1.htm ...In general, the Earth's climate has always fluctuated (mankind has always adapted or suffered because of it), and at present there are no abnormal conditions. There are times in the past when the concentration of CO2 in the atmosphere was 100 times higher, but even then there was no catastrophic heating. In the past 100 years, the average temperature of the Earth has risen by 0.7 plus-or-minus 1.3 degrees Celsius, which means that it's probably heated up a little, but may have stayed the same or become cooler.There is misinformation everywhere saying that the science has been done and there is a general agreement, but there is not:http://www.petitionproject.org/