This article is about how California sea lions are having a large increase of deaths from cancer, specifically metastatic cancer. It's been found that 18% of all sea lion rescues are caused by cancer, and most die from it. This is really sad because it is most likely due to either prior use of pesticides, such as DDT, that were used 20-30 years ago, or from the mass amount of pollution coming from California cities. It could also be that it is a combination of a lot of different things; researchers can't really find the real reason because it is a non-point source of pollution. This is not only happening to sea lions though. Beluga whales have the same problem with roughly the same amount of cancer killed whales washing up on shore. I think this is a major environmental problem, but one that is extremely hard to fix because it comes from mass amounts of pollution.
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