If our economic indicators show worse economic performance when we take steps to improve human health, then it is the economic indicators that need to be revamped. Carbon tax is one of the least intrusive ways to deal with climate change. If you want draconian measures, just wait this out under business as usual, and civilizational collapse will follow. Syria, Central American refugees, Cape Town, heat waves, droughts, fires, floods ... this is what climate change looks like, and it's here now. Do you think dealing with these destabilizing disasters as they come along is cheaper than having a carbon tax?