CO2 makes water acidic. Acidic water screws with a lot of aquatic organisms. Aquatic organisms create a large amount of the planet's oxygen. Considering the mar

CO2 makes water acidic. Acidic water screws with a lot of aquatic organisms. Aquatic organisms create a large amount of the planet's oxygen. Considering the marine ecosystem is extremely sensitive, well, I can see how high CO2 could be a problem even if we humans can still breathe just fine.