In practice, you'd focus on factories, powerplants, the road owners, auto-makers, etc. This is similar to how regulations already work. The regulators tend to i

In practice, you'd focus on factories, powerplants, the road owners, auto-makers, etc. This is similar to how regulations already work. The regulators tend to ignore the rogue backyard barbecuer and instead focus on the big polluters. Also, aggregation techniques could be used for both defendants (polluters) and plaintiffs (landowners and other people being poisoned.)