Well, those shingles are a goodly idea but they are only part of the solution.
If you don't have a large battery array (which I do have, that's because I'm 100% off grid) then you're drawing power once the sun goes down. That means you need a baseline load from somewhere--coal most likely, hydro or nuclear, there are a some gas plants there too.
If they want to have a battery stack that also requires some wiring work and at least one inverter (to convert from DC power to AC power). In my case I had to have two inverters because it's a "leggy" house, and two microwaves at different ends of the house plus a well kicking on wasn't going do it. There are a different strategies to wire up the shingles to feed into the power grid (if without battery) or to battery (or if that's the option). Either way that's copper and wiring and all the fun with that
I think anybody who can be off grid should if they can--not because of silly global warming, just because it gives you independence.