wait for it.
No one really knows how much petroleum is under the north shore of alaska. Much of it has never been explored by drilling, the only way to calculate reserves and their recoverability. Even if it is huge, it will not be enough to make us independent energy producers. No way.
I believe it should be left in the ground as a stratigic reserve. Save it for later, when we really need it. And it will get drilled later, enviromental concerns or not.