Sure. Essentially what happens is the ocean absorbs much of the CO2 that’s released by us. If you’ve ever heard the term “ocean acidification” that’s what causes it.

Water and the oceans change on a much more gradual scale than the atmosphere, so it takes decades for the CO2 to be released back into the air. For example, if you bring a pot of water to an open flame it still takes time for the water to reach the temperature to boil, it’s not instantaneous.

The ocean is far more massive than our atmosphere. It’ll take time for the changes to take effect, especially a noticeable one on our end. But if you take a look at the ph levels of the oceans over the last century it becomes abundantly clear we’re messing things up big time.