This University of Chicago Booth webpage reports the unanimous agreement among some 25 top economists with the statement that; "The recent decline in oil prices will promote higher real GDP in the US over the next couple of years." So, I must ask a symmetry question. If we introduce carbon pricing and thus raise gas taxes, are these economists saying that real GDP would be lower over the next couple of years? What is the macro economic cost of combating climate change? In California, it has been claimed that our AB32 Legislation will increase economic growth.