not only does this suffocate everything. but it, also, steals the oxygen at these depths as it decomposes, creating dead zones. but phytoplankton is one of the lynchpins of life on the planet. it's not the villain here. the imbalance that caused all of this? us. humans. our pollution. it causes an excess of nutrients in the water that acts as a catalyst for massive blooms. as does the manmade-climate crisis that we have failed to prevent, or even slow down. water temperatures here have increased by 2 degrees in the last-50 years, says a professor who studies the impact of climate change on marine biodiversity. >> when you look at this, what do you think? >> i think it's nature's spitting in our faces. simply. and this is ecologically [ inaudible ].