The absurd waste of energy in moving a 4000lb object to deliver a 1lb object. You can attribute that to whatever source you want. It's still wasted energy.
Wasted energy isn't exactly emissions. The claim was really specific, so I wanted to figure out what they meant by it. Of course, on the east coast they use a lot more coal, so there is a point to made I guess.
I think it is dumb to use Waymo cars, but E-bikes would work really well here. I'm sure whoever breaks through this market will come with some sort of light vehicle solution. Waymo seems to be doing this as a side project to use their vehicles when ride share demand is low.
