We haven't explored that, but carbon capture technology would work for residential chimneys. The challenge would be figuring out how to pick up the captured CO2 from so many different locations. One of the reason we're initially targeting trucks is that they drive on extremely concentrated freight corridors, so we'll mainly have to collect CO2 from truck stops along a set of key routes.
Might be worth adapting this for restaurants with coal/gas fired ovens. They would more consistent producers of CO2 - not only during winter months. You could lease the capture devices to restaurants and take a larger portion of the co2 revenue. The co2 capture might have marketing appeal to differentiate a restaurant from competitors, too.
This is a great thought — I have a similar response around the challenges with picking up the captured CO2 from such a decentralized network of capturing devices, but definitely something we'll explore down the line.
Maybe only in locations near enough a place to sell the carbon. I have no ideas what the value of the carbon is, but at some point hopefully it's worth concrete producers driving to pump and take it away.