Government control of what exactly? Lowering emissions?
Never an argument about the merits of the proposal, just some trite hand-wringing that somewhere somehow someone might be able to use it to their political advantage. Never even an explanation of why this one thing would be so dangerous when governments already by nature have vast authority to control pretty much anything they want.
Worst of all you can't reason against it, since it's not a position of reason. Regardless of what point you make they'll just dig in and ignore them. :(