Alright guys, let's just analyze this calmly. Ther are dead spots in the ocean caused by areas that have no oxygen. They are blaming Nitrogen for the death of alga for asorbing the oxogen. Alga is a plant and nitrogen is a fertilizer. Does this explanation make sense. Chemtrails are reportedly reflecting light causing less heat to reach the Earth from the Sun. Now let's put the 2 together slightly differently and we get.
Because most of the planet is covered by water, and most of the plant life converting CO2 to Oxygen is in the ocean
The fallout from the chemtrails gets washed out to sea and reflect light needed for photosynthesis causing the alga to die. The dead alga then absorbes the Oxygen then causing the dead zone.