Sustainable energy employs far more people than coal and gas.
It's less productive. By a lot. Of course it takes a lot more people to do a lot less.
Your statement makes no sense. As far as productivity, once installed, you never have to pay another electric bill...........for life! As far as "...a lot more people...", that's jobs, mother-******! That's putting people back to work. That grows the economy. And that's a good thing.
Actually ... not. Installation of a solar system ranges from $3500 for a non-battery, daytime only system which -- if you live in a very sunny area -- could cut your power bill by 50% (realistically, you can only get 3-6 hours of full power from a solar system even on a sunny day. But, let's make the math easier). The average residential electric bill in the US is $110 monthly. That means a 63 month payback, just over five years. An off-grid system with batteries will run back at least $15,000 (very small system with no generator backup) and at a very optimistic 100% electrical savings, your payback is 136 months or more than 11 years. Solar panels have a life-expectancy of 10 years, deep cycle batteries under continuous use last 3 years. You'll lose 10% of your charge capacity per year. So, before you've finished paying it off, you'll have to replace nearly the entire system.
As for the jobs. The panels, charge controller, and batteries are made in Asia and resold as full kits here in the US. Installation of solar is a low-skill job. Only people making any money are the salesforce.