How much can we gain from Drilling off shore?

Ken Salazar, the Secretary of the Interior for the United States, has been kicking about the idea of drilling off the shores of California. He visited the state, and much to his chagrin, I imagine, he was met with opposition by the states leaders across party lines (a lot of them). They said, we like the coastline the way it is now, an attraction for people to come and enjoy. They said, we should be investing in alternative and renewable energy, instead of drilling more fossil fuels. Then say said this:
"The potential output of oil (estimated 1% of US daily consumption by 2030) comes no where near to justifying the risk posed to its economy and ecosystem." All that damage, irreversible destruction to a beautiful space, for 1% by 2030? Is this the best we can hope for from more drilling? I remember during the campaign last summer, when more drilling was a talking point, that any benefits would not be seen for at least a decade or longer, but at least they made it sound like there would be oil to make it worth it. Then, at least, there was an argument to be had, and we did. But there is not even an argument to be had over this one, is there?
Drill, Baby, Drill, for one more percentage point of daily usage in 18 years! Doesn't quite have the same ring to it, you know?