A recent study showed that high carbon dioxide level has big impact to oceans as it makes seawater more acidic, which in turn hampers marine process called nitrogen fixation.
Researchers analyzed green algae, red algae, and glaucophytes to find the origin of photosynthesis. Glaucophyte Cyanophora paradoxa and cyanobacteria have the similar respiratory effect on photosynthesis
scientists found cyanobacteria is the first organism on earth that produced oxygen for the first time. It was often thought that the bacteria is blue-green algae. In a recent study, researchers found it is not an alga. It is actually bacteria which first introduced Oxygen on Earth.