As climate change warms rivers, they are running out of breath – and so could the plants and animals they harbor

If oxygen levels drop too low, river species will suffocate...

https://theconversation.com/as-climate-change-warms-rivers-they-are-running-out-of-breath-and-so-could-the-plants-and-animals-they-harbor-213297

Video Presents Flawed Test on Masks, Oxygen Levels - FactCheck.org

A viral video questions the safety of face masks by using a gas detector to purportedly show that masks result in dangerous oxygen levels for the wearer. But experts — and the company that makes the gas detector — say the video’s test is scientifically flawed. https://www.factcheck.org/2020/07/video-presents-flawed-test-on-masks-oxygen-levels/

Climate change: Oceans running out of oxygen as temperatures rise - BBC News

While nutrient run-off has been known for decades, researchers say that climate change is making the lack of oxygen worse.
https://www.bbc.com/news/science-environment-50690995

Earth's Oceans Suffocating And Creating More 'Dead Zones': Study : SCIENCE : Tech Times

Parts of the world's oceans with zero oxygen have increased up to four times according to a new study by an international team of scientists. This is problematic because it threatens the destruction of marine ecosystems and because a majority of the Earth's oxygen comes from the oceans.....
http://www.techtimes.com/articles/218187/20180107/earths-oceans-suffocating-and-creating-more-dead-zones-study.htm

Climate Change Is Suffocating Large Parts of the Ocean -- National Geographic

A new study says warming has reduced the oxygen levels in large swaths of the deep ocean, threatening marine life around the world. ....
https://news.nationalgeographic.com/2018/01/climate-change-suffocating-low-oxygen-zones-ocean/

Donald Trump Is A Threat to Survival of Life on Earth: If Nuclear War Doesn't Get Us, Falling Oxygen Levels Will - Newsweek

The terrifying math of climate change shows us that in order to stay within the 2-degree safety limit, the majority of the world's existing fossil fuel reserves need to stay in the ground.....
http://www.newsweek.com/donald-trump-threatens-survival-life-earth-climate-change-670144

Oxygen levels ‘falling 2 to 3 times faster than predicted’ in our warming oceans

Carbon pollution is suffocating ocean life and speeding up the next mass extinction...
https://thinkprogress.org/oxygen-levels-falling-2-to-3-times-faster-than-predicted-in-our-warming-oceans-7c1e9b48cd42