The point was that land which used to be a Coal mine can be surprisingly green. To the extent that something we normally consider unquestioningly eco-friendly -

The point was that land which used to be a Coal mine can be surprisingly green. To the extent that something we normally consider unquestioningly eco-friendly - like large arrays of solar power collectors - could have a more degraded local environment in their direct vicinity (though they are beneficial overall). I don't think anyone's saying coal is good or solar is bad here.