Phoenix Business Journal: The catastrophic oil spill in the Gulf of Mexico has given new momentum to climate change legislation, but capping carbon emissions still faces a difficult road in the Senate. President Barack Obama pointed to the “inherent risks to drilling 4 miles beneath the surface of the Earth’ as a reason to “aggressively accelerate’ the nation’s transition to a “clean energy economy.’ The only way to do this, he said, is “putting a price on carbon pollution’ so that “capital comes off the …