I think announcing a ban is part of a phase out policy. The problem with relying just on gradual mechanisms is the "boiling frog" effect acting against you. A d

I think announcing a ban is part of a phase out policy. The problem with relying just on gradual mechanisms is the "boiling frog" effect acting against you. A drastic announcement spurs people out of complacency. By the time you get to the deadline, the ban might not even be needed.