The article talks about trees and how many we need to sustain our consumption. As far as I know, roughly half of produced oxygen comes from the ocean, primarily

The article talks about trees and how many we need to sustain our consumption. As far as I know, roughly half of produced oxygen comes from the ocean, primarily produced by algae. Seems pretty strange to publish an article about oxygen reserves if you don't even know where the oxygen comes from. Also consider that climate change threatens the algae responsible for this oxygen we breathe. It also threatens forests with increased frequency and severity of forest fires, not to mention the deforestation we ourselves are responsible for. I wouldn't be surprised if this oxygen problem becomes a real problem much sooner than the article estimates.