IMO, it is reasonable to curtail the opening of new coal mines when existing ones are financially struggling due to oversupply which in part is due to China economic sanctions.
This is not rocket science regardless of whether one is Left or Right;
There is the marketing triangle of supply, demand and price. Increase supply and/or reduce demand and the price goes down !!!
The Lefties want to close down coal mines, the Right want to open more and reasonable Malcolm in he middle is saying "don't open any more but maintain what we've got" reasonable eh?