Why is the term "greenhouse effect" misleading when used to describe ocean warming and acidification?

The reason why using the term "greenhouse effect" to describe ocean warming and acidification is misleading because:

First of all, they are originated from very different reasons, as well as the impact they have on the ecosystem.

Explanation:

First of all, the greenhouse effect is the concept used to name the phenomenon in which the radiation of a planet's atmosphere not only the earth's atmosphere, warms the planet's surface increasing the temperature. On the other hand, acidification is the concept to name the phenomenon in which the water of the oceans decreases its PH because it takes too much carbon dioxide from the atmosphere.