Read here. A recent study by alarmist scientists has implicated global warming as the cause of a 50% reduction of the oceans' phytoplankton over the last century. Fortunately for humanity and the oceans, the study seems to be fairly lame in terms of science:
So, if there actually has been a 50% reduction in sea plankton, and if global warming isn't the culprit, then what is? Very possibly it's the intensive overfishing practiced by humans that is the cause:
1. There are numerous places in extremely warm sea waters where plankton thrives.
2. Plankton populations appear to be better correlated to water nutrient abundance, not temperatures.
3. Increased CO2 from human emissions should have increased the plankton population since it is a major nutrient.
4. The likelihood that a 4/10's of a degree increase in sea temperatures would cause a 50% reduction in marine life is essentially a ludicrous finding.
"The problem is that we have fished out the oceans. Only 10% of the large fish found in the oceans in 1950 remain. And we have been over-fishing the oceans far longer than just the last 60 years. Even back in 1950, people were already noticing a reduction in stocks of whales, salmon, cod, halibut, and other fish. We probably have less than 10% of the large fish and whale stocks that were present before we began harvesting the seas in earnest...Where does the nitrogen that phytoplankton require come from? At the the mid-ocean levels, some comes from nitrogen fixing bacteria, but the rest comes from excrement in the form of urea and ammonia from bacteria breaking down protein as carcasses decompose. Iron, molybdenum, and phosphates come from the same sources. But remember we are removing large amounts of fish protein from the ocean, especially whale, tuna, shark, and other large fish. 90% of what was there is now gone. We are removing more every year. The fish products are no longer available to the phytoplanktons. Their food supply has diminished. They are starving."