The mining of domestic coal, the mining of foreign coal, and the consumption of coal for business purposes, are are all separate issues.

For those states, that still use coal and could not obtain domestic coal, they had to import foreign coal.

Whether the coal was foreign or domestic, there are many businesses, that still rely on coal.

Forcing the domestic coal industry, to go out of business, didn't really solve the problem, for the many businesses, that have used coal for decades, or a century or more.

It is easy for people, to tell businesses, on how to run their businesses.