Arguing about tailpipe emissions misses the point. To a first approximation, the economic activity generated by owning and using something, referred to as the total cost of ownership (TCO), is proportional to the resources consumed and the environmental impact of that use.
For example, a solar electricity or solar heat system is green if pays for itself over it's lifetime (the TCO is actually negative). The same goes for CFL and LED light bulbs. If, however, they never generate (or save) as much energy as it takes to manufacture them, they actually hurt the environment.
More efficient (lower cost per mile) vehicle technology isn't generally green unless it reduces TCO: a small, low-cost, high-mileage ICE car creates much less economic activity, and hence much less environmental impact, than a large, expensive BEV like the Model S.
I own a Model S and I love it. I just don't pretend that the lack of fumes makes it green.