Could blue-green algae be a solution to global warming?

Question

I was just watching a PBS program called "Restless Earth" which mentioned that earth's atmosphere used to be primarily carbon dioxide and other toxic gases before life began to form, but that blue-green algae combined carbon dioxide with sunlight (I think?) to form oxygen. Could this be part of the solution to global warming?

Answer 1

no, because global warming doesn't exist, just like the evollution theory

Answer 2

No,

Because the algae if introduced somewhere it was not before would choke out some other type of algae that a certain fish survives on, and make the floors of lakes and rivers dark.  All sorts of different crustaceans, simple organisms,  water plants, and some fish would die because of the lack of light.

Just like zebra muscles that came in the ballast of boats from the ocean - they cleaned up some of the muck in the great lakes and made areas crystal clear but then as a side effect, killed some of the fish that relied on that muck.