‘Natural gas’ is a fossil fuel. A lot better than coal, yes, and a lot of people still use it (well-tuned modern furnaces are 90% efficient). Unlike ICE engines with their 20-30% gasoline efficiency (buy 4 gallons, throw 3 into the wind).
In a sane world, all coal would be shut down NOW, all users would be shit-outta-luck. There are NO excuses for continued use.
If you could retire and have enough to keep you comfortably housed and insured until you’re 90, that’s wealth enough.