Changing the laws or enforcement will take a while and software won't help directly. But extensive crowd-sourced measurement of externalities would be a big dea

Changing the laws or enforcement will take a while and software won't help directly. But extensive crowd-sourced measurement of externalities would be a big deal and software should help with that. Actual measurement (and definition) of externalities will be very diverse, so the tracking will have to evolve and expand. Crowd-sourcing can handle that. Once externalities can be clearly documented, public opinion will shift and companies will start to change their behavior in response. Then enforcement and laws will follow.