Solar Facade
Look at this aerial view of the Porter Square mall. Look at the thin strip of solar panels along the front edge of the building, now look at the vast expanse of roof not covered by solar panels. That's the difference between solar panels being a popular thing that can be used for a little "greenwashing", and solar panels being an actually good economic idea. If solar panels paid for themselves and were profitable (and profitable at a better rate than basic conservative investments like bond funds), every roof would be covered in them. We're not there yet, I want us to be. I want solar to be cheap and effective and I want Coal and Natural Gas taxed to offset their externalities.