Take climate change. Other than Mitt Romney's throwaway line ridiculing the rise of sea levels, there has been little substantive discussion of this global peril. The parties, meanwhile, advocate "energy independence," something that is neither desirable nor achievable in this era. The oil market is truly global, and no country can control prices that fluctuate with global supply and demand. Solely national markets simply do not exist anymore — not in steel, not in oil, not even in labor. Our immigration problems are a function of a global labor market that is beyond our ability to control.