Keystone Pipeline

Today BO put the chill on the Keystone Pipeline project to bring oil from Canada and North Dakota to Cushing, Oklahoma, and the Texas Gulf Coast refineries to make us more independent of oil from foreign sources that don't like us, just our $$. This project would provide about 10,000 jobs over the next several years in an economy that is reeling from record high unemployment.  So, the big BO in his infinite wisdom defers the construction of the pipeline to an indefinite time to seek better solutions (like Solyndra, I suppose).  He bowed (Once again.  That's what he does best.) to the whims of the environmentalists this time.  This is insanity.  Since when has one person even if he is president ever had the authority to shut down a major construction project to bring much need oil to this country?  Where in the Constitution does BO think he gets this authority?  I have a small booklet copy of the Constitution I keep handy.  I've read it cover to cover a number of times and read various parts numerous times.  I can tell you there is nothing in the Constitution that gives BO the power to unilaterally shut down any kind of construction project.  That's what dictators do.