Christopher has a good point but not sure works on seep but not only are there seeps but also what is termed Asphalt Volcanoes off both West Coast & Gulf Coast for past 30,000 years (probably source of tar washing onshore that wasnt from BP spill). But he will waste your time trying convince liberals or environmental goofs on this topic.
What amazes me is how the Environmentalist use dead birds as tool against oil/energy industry but never any Green energy. They nor liberal press find time tell us that Wind Farms are killing +100,000 birds a year including those on endangered species list like Golden & Bald Eagles and Whooping crane. Worse Wind Energy has no permit requirement forcing them do better as they are trying force oil companies. And they even got credit for pushing recent permit to allow them kill 5 Eagles/year!
Compare that against Chevron stopping major project to save hatching Owls in Mississippi!
While were talking about Green heart of Black Oil industry vs. Black Heart of Green Energy Industry C should also mention that Oil Industry saved the Whales by replacing whale oil with Refined products in 1890s.