"(electricity) for them can come from solar panels"

But the reality is that the majority of electricity does not come from solar panels.  The real fuel for solar panels is the redistribution of tax dollars to subsidize the solar industry.  A comparison of the nonsense of what-ifs or could-be would be to say that hydrocarbon cars could be fueled by algae fuels making them net zero emitters that are far cleaner than electrics.  The bottom line is that I live in a world of realities and much of the claims by those who want to project their image of being green are false.  

The best way to be green is to change your own activities & lifestyle.  A good gauge for a person's concern for the environment is not their lip-service but instead their actions.  Add together the square footage of their office space, primary dwelling, secondary dwelling, plus the prorated luxury accommodations used (restaurants, gyms, hotels, etc) and you will come up with a comparative impact number.