[chatmasta]

Yes, I came here to post this. Uber could accrue some nice PR by reporting aggregate statistics in terms of Co2 saved, dollars saved, etc. They could also report those stats on an individual level.

Still, these calculations could be pretty difficult. There are a lot of unknown variables. What was each customer's alternative mode of transport? Did the customer actually have a car before? Etc.

Re: your incentive point, I'm not sure how that would work with emissions since it would basically just be "who drives the most," but I could see Uber promoting some incentive programs to get people to sell their car. They could even buy cars from people, in exchange for cash and/or uber credits, then repurpose those cars as uber vehicles.