Exactly this! The oceans take up a ton of the carbon we put in the atmosphere. That is also why the pH of the ocean has steadily decreased since the Industrial Revolution, but also why warming was not seen early on. It is basically the same mechanism as a soda stream. You increase the CO2 above the water and it goes into the water forming our favorite carbonated beverages. I have attached an image I use in my climate lecture for my non-major students. You can see that natural forcings enough (the long-term forcings caused by our orbit and natural solar cycles) to attribute for our current warming, but the effects with natural + anthropogenic match up pretty darn well. Plus I have never understood how people can ignore the laws of thermodynamics when it comes to internal combustion. Energy can neither be created nor destroyed, yet some want to believe that billions of engines and furnaces all over the world burning fuel can't change the 'energy' in our system, which is earth's atmosphere. It really is mind boggling.