Sorry, but I'm an engineer. Be careful in talking about CO vrs CO2. Both are in auto exhaust. CO is a component of air pollution. The EPE regulates CO at the tailpipe to around 3.4 to 4.4 g/mile, measured with the engine at an idle. Nearly all of the rest of the carbon going out the pipe is CO2. CO2 is the Greenhouse gas. When you burn gasoline or any hydrocarbon, almost all of the Carbon leaves as CO2, a small amount is CO, and a very small amount very small amount is HCO. All the carbon going into the fire comes back out as Carbon+something. There is a calculator at cotap.org for estimating CO2 based on MPG and miles driven. Good Luck

From: "thethinktank-request@lists.bikecollectives.org" thethinktank-request@lists.bikecollectives.org To: thethinktank@lists.bikecollectives.org Sent: Monday, December 9, 2013 2:19 PM Subject: Thethinktank Digest, Vol 88, Issue 12

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Today's Topics:

1. Measuring carbon emission reduction or car use    reduction       (La Bikery)   2. Re: Measuring carbon emission reduction or car    use    reduction       (Martin, Eric Vance)   3. Re: Measuring carbon emission reduction or car    use    reduction       (james bledsoe)   4. Re: Measuring carbon emission reduction or    car    use    reduction       (Martin, Eric Vance)

Message: 1 Date: Mon, 9 Dec 2013 13:37:12 -0400 From: La Bikery labikery@gmail.com To: The Think Tank Thethinktank@lists.bikecollectives.org Subject: [TheThinkTank] Measuring carbon emission reduction or car use     reduction Message-ID:     CAFanTAEQ6+JPodTU_fAw_dg4YnNSjJNtt28Kj5Qm7f54vkgGng@mail.gmail.com Content-Type: text/plain; charset="iso-8859-1"

Hello Friends,

We are in the process of applying for a grant and want to make a case that we contribute to a reduction in CO2 emissions and reduction in car use. Does anyone have experience or ideas about how we might be able to measure our impact on that specific issue?

Cheers,

Amanda