Above all else Tillerson is a globalist. So the real question is how does restricting coal further that objective?
1. It makes energy more expensive in America
2. By restricting America (we are the target of the treaty) it helps to transfer wealth (business, investment) to other countries.
3. CEOs like him aren't America first kinda people. They have very little loyalty to this country.
4. Does this move against coal harm competing companies who have investments in American coal?