This is very true, Its emitting already present CO2. Now My personal theory is that with the constant release of CO2 we will be eventual creating a similar atmosphere similar to that of which helped wipe out the Dinosaurs. Now what created that atmosphere in the first place is beyond my research right now. But whether or not the Co2 emissions are creating "Global warming" or not, we should all want to use alternative energies. Its good to help reduce health risk that are associated with petroleum diesel particulate matter which is known to be Carcinogenic. Stopping the Fat Cat big oil companies from profiting so much off of the people and giving money to these countries that have been linked to supplying terrorist with resources should be another reason for motivation. I myself plan on making my own Biodiesel once I get enough space to set my own refinery.