So one of the lessons we've learned from this spill is that we need better regulations, better safety standards, and better enforcement when it comes to offshore drilling. But a larger lesson is that no matter how much we improve our regulation of the industry, drilling for oil these days entails greater risk. After all, oil is a finite resource. We consume more than 20 percent of the world's oil, but have less than 2 percent of the world's oil reserves. And that's part of the reason oil companies are drilling a mile beneath the surface of the ocean -- because we're running out of places to drill on land and in shallow water.