Good, that’s a very good first step. Once we’re clear that most of the heat in the biosphere is in the ocean, and that heat from the atmosphere is not going to substantially affect the ocean, but rather, heat from the ocean is going to substantially affect the atmosphere (La Nina/El Nino), we can stop panicking about GHG levels in the atmosphere (of any type), and understand that even if we burnt every last ounce of natural petroleum tomorrow, and increased CO2 to 1400 ppm, we would have a minimal effect.
As for the oceans, they’re basic, not acidic. CO2 additions would cause neutralization. And yes, while the buffer can run out, our planet would be better called “Water” than “Earth”, given the sheer amount of liquid H2O we have :)
As for diets, anyone who is fat has a very specific dietary need — reduce carbohydrate intake. Insulin drives fat accumulation; blood sugar drives insulin; carbohydrate intake drives blood sugar. We have essential amino acids, and essential fatty acids, but thanks to gluconeogenesis, there is no such thing as an essential carbohydrate.
A thought experiment for you — you’ve been invited to a gourmet meal. The host says, “Bring your appetite!” What might you do to generate an appetite?
Perhaps you’d skip a meal, aka “eat less”?
Perhaps you’d do a workout to “work up an appetite”, aka “exercise more”?
Now, why would you think a prescription for getting hungrier would be a useful way of reducing obesity?