Earlier quoted context omitted.
And yet development should take the environment into consideration because it can have massive consequences. Those consequences are ultimately an externality of the development project and evaluating it in advance can help inform the true financials of the project.
I wonder whether those that were taking the environment in to consideration for the development thought beyond the project to what environmental impacts could be lessened by the project. I'm not a Musk fanboy, but if these tunnels will work the way he's suggesting, the amount of traffic that would be removed from the roads (and by extension, the pollution) would probably be a net benefit to the environment.
I don't understand how any pollution would be removed, just because it's now in tunnels doesn't equal it being gone.
Wouldn't it just be blasted back out through the ventilation system? Or were there plans to build some kind of "pollution scrubbing" into those?