The rats backed themselves into a corner. If they say pollution, blue states that still create pollution from their manufacturing practices will be impacted.
However, if they say it is climate change, they are stuck due to their wrongful belief that CO2 is the cause of the problem.
Best thing for Trump to do is announce that the department of the interior is going to work on a forestation and land management plan to eliminate old growth trees which causes forest fires, and planting (pick a number) trees to better capture CO2.
The biggest cause of increased carbon emissions is population growth. But no one will touch that issue. There is no money in it. They are looking for cash flows that can be skimmed.
Carbon tax is perfect.