The U.S. is still years away from establishing a national carbon tax or cap-and-trade system — and it’s certainly possible it will never take either step. But there are state and regional cap-and-trade programs in place to incentivize refiners and others to reduce their greenhouse gas (GHG) emissions. In today’s RBN blog, our fourth and final on carbon emissions and the refining sector, we look at state and international efforts to reduce GHG emissions and their prospective impact on the U.S. refining industry.