What effects will the changing pH and temperature have on algee cover on bottom. How will this influence kelp?

No CO2 effect. But big effect of temperature Interactive effetc: the effect of acidification has to be seen with temperature. Temp with CO2 has an interactive effect elevated CO2 + elevated temp -> biggest effect! Bigger temp and CO2 -> more algee cover on bottom. This is bad news for kelp since kelp is most succesfull in the abscence of algee cover.