Check oil spill data since the double-hull fleet re-tooling post-Exxon Valdez, and the refinement of sophisticated GPS navigation systems.  Check insurance requirements for tankers, and the Ship-source Oil Pollution Fund. 

In short, take just the few short moments required to inform yourself about just some of the relevant information before resorting to the type of alarmist provocations that shallow environuts and their droning copycats launch into the zeitgeist.