tag:blogger.com,1999:blog-2267239157639402048.post1076973551649282214..comments2008-10-30T16:18:30.802-07:00Sasha Friedmanhttp://www.blogger.com/profile/10107591429416774036noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-2267239157639402048.post-88996765236444692602008-10-30T16:18:00.000-07:002008-10-30T16:18:00.000-07:00Hi Spencer - you are correct in that I was referring to lifecycle emission decreases and not just straight tailpipe emission decreases. Pretty much whenever I quote emission statistics, they will be life-cycle based.<BR/><BR/>Lifecycle analysis takes a holistic look, from cradle to grave, at the different stages of inputs and outputs of a process. <BR/><BR/>This creates some interesting statistics and ideas - mainly a big boost for reducing and reusing.<BR/><BR/>For example, about 50% of a car's lifetime emissions will be generated by the time it gets to a dealer's lot - a good argument for buying used cars.<BR/><BR/>SashaSasha Friedmanhttp://www.blogger.com/profile/10107591429416774036noreply@blogger.comtag:blogger.com,1999:blog-2267239157639402048.post-10107000671305119482008-10-30T14:00:00.000-07:002008-10-30T14:00:00.000-07:00There should definitely *not* be a decrease in CO2 emissions per mile driven on a car running E85 versus gasoline.<BR/><BR/>What you may have mistaken it with is net CO2 emissions, because people who write about the CO2 emissions from E85 take into account the fact that the corn used to grow it absorbs CO2 (so the balance of CO2 emitted is somewhat less - perhaps 41% as you mentioned).<BR/><BR/>But either way, in an internal combustion engine, you will always have CO2 emitted, and no fuel will emit less except for hydrogen. <BR/><BR/>The same is true for biodiesel; B99 emits as much carbon dioxide as dino diesel, but when you take into account the CO2 absorbed by the soybeans used to make the biodiesel, the *net* CO2 emissions are less.Spencerhttp://www.blogger.com/profile/05280631312248397444noreply@blogger.com