On Wednesday, Pennsylvania House Bill (HB) 637, which would block the PA Dept. of Environmental Protection (DEP) authority to limit carbon dioxide emissions (thereby blocking PA’s entrance into the Regional Greenhouse Gas Initiative, or RGGI) passed by a vote of 126 to 72. Some 10 Democrats crossed the aisle to vote in favor of the bill. HB 637 now goes to the PA Senate for a vote. What then?