Imagine just the healthcare cost savings and the productivity gains alone from using cleaner power generation.
Phasing out coal power is a no brainer because there are plenty of alternatives to use, and renewable energies like solar will make our grid more resilient by making power generation more diffuse.
Electrifying cars is a longer-term issue. But if you can electrify cars, you can power them from cleaner sources. Even if you don't power them with cleaner sources, you'd still get less localized particulate pollution.
Whether or not you care about global warming or the planet itself, you'd get big benefits personally for your health and your family's health if we had cleaner power generation.
http://www.carbontracker.org/in-the-media/phasing-out-coal-p...
http://www.carbontracker.org/in-the-media/phasing-out-coal-p...
The issue is that they're mostly escaping market forces due to how they are regulated:
"“Merchant” coal owners operating in competitive wholesale markets have lost nearly half their value in the last two years amid fierce competition from cheap gas and renewables. However, two thirds of coal plants are “regulated” and receive government-approved prices which cover their costs. This means that consumers rather than shareholders pick up the bill for supporting uneconomic coal plants."
Once you start counting actual externalities you get numbers like $5 Trillion a year subsides for fossil fuels globally, as estimated by the IMF, 7% of global GDP:
http://www.imf.org/en/News/Articles/2015/09/28/04/53/sonew07...
Giving up coal for electricity production would be roughly the same health benefit as everyone in the country giving up smoking cigarettes, drinking alcohol and eating fast food combined and save 10 billion dollars a year.