They drill off of California, how are the beaches there?
When I worked in the oilfield in the Gulf of Mehico in the early eighties damn near everything was tossed overboard. We used to burn the trash in a steel basket held over the side by one of the cranes and put it out by dunking it into the water. The fish loved it, but there was always a junk slick of un-edibles that just floated away, to the beach. Of course, LA beaches are not and will not ever equal Florida's crystal clear water. It's at the end of the Mighty Mississip.
The last time I worked out there in the mid 90's, you couldn't so much as spit over the side. VERY environmentally conscience. The fines were staggering and the companies were/are all gung ho on clean.
I'm all for renewable energy and efficiency, but our oil dependency is still here and is not going to leave even if we all drive electric cars. It would knock a big chunk out of the gas requirements, but as long as we need plastics, medicines, cosmetics, etc. we still need the stuff.
However, I did see that someone was working on bio-plastics that seemed viable.
From what I remember from my organic chemistry class, if you have a mountain of limestone you can make anything chemically that is made from oil, but that was so long ago that I may have dreamed that up. Make carbide, generate acetelyne and go from there. Just not as cheap as oil.