Phytoplankton is responsible for 50-80% of all oxygen in the atmosphere. The World wide phytoplankton population has been in decline since the 50’s, down almo

Phytoplankton is responsible for 50-80% of all oxygen in the atmosphere. The World wide phytoplankton population has been in decline since the 50’s, down almost 40%. As the population continues to decline it will hit a tipping point and the population will crash, when that happens, we’ll get to witness what happens when oxygen levels decline.