Another (potential) effect of a Republican Senate could be a shift in the balance of economic growth vs. reductions in our carbon emissions. The pipeline from Canada has been talked about here already. Mitch McConnell has also said that the President has been "waging a war on coal", and represents Kentucky, a major coal mining state. House Speaker John Boehner was recently asked about reducing carbon emissions, and his answer was, Listen, Im not qualified to debate the science over climate change, but I am astute enough to understand that every proposal that has come out of this administration to deal with climate change involves hurting our economy and killing American jobs. So I think the world can probably expect the United States to contribute more to carbon emissions over the next 6 years, in an effort to turn our economy around.