Possibility to use fast-growing sea plant to cool the earth?

[philton]

Can we use fast-growing sea plant to increase the surface area of the sea, enhance global evaporation, and get the Earth cooler?

Do we know some sea plants growing really fast with photosynthesis?

I was struck with this idea when I was doing a search on giant vegetables on land.

 

[Dr. Courtney]

How would this plant increase atmospheric water vapor?

Double check your assumption: what would the effect of more atmospheric water vapor be?

Most believe the benefit of increased global photosynhesis is that CO2 is added to a carbon sink.

 

[philton]

1) I'm not sure yet. But my conjecture is that it could be kind of similar to the effect of the sweat hairs on a human body.

2) I guess more evaporation leads to more cloud which reflect more sun light back to the outer space, though I have no proof on this assumption.

I know there are some researches on the relation between the phytoplankton and the cloud above the sea. http://www.futurity.org/plankton-oceans-clouds-962922/ However the assumption posted here is a slightly different approach for mind storming.

How would this plant increase atmospheric water vapor?

Double check your assumption: what would the effect of more atmospheric water vapor be?

Most believe the benefit of increased global photosynhesis is that CO2 is added to a carbon sink.

 

[jack476]

Unfortunately, it's a bad idea.

Algae blooms can cause devastation to aquatic ecosystems when decomposition of dead algae uses up all of the oxygen in the water, it's a process called eutrophication. This process can end up killing off every single thing in a body of water besides anaerobic bacteria and animals that can tolerate extremely low quantities of oxygen, so the end result would be that the sea plant itself would die off eventually, along with all of the other carbon dioxide absorbing plants that were there before it. The worst case scenario would be that methane released by the decomposition would end up contributing even more to global warming.