A demonstrator runs past a burning car during a demonstration in Paris on Saturday, Dec. 1, 2018, against an increase in fuel taxes. Even proponents of carbon taxes acknowledge that an increase in fuel taxes can disproportionally hurt low-income people. Energy costs make up a larger portion of their overall expenses, so a fuel price increase eats up more of their paycheck and leaves with less to spend. (AP Photo/Thibault Camus)