[Hot Tabasco]

Since fertilizer runoff into lakes allegedly creates algae bloom, simply dump tons of fertilizer into the oxygen low areas of the ocean. The fertilizer will cause the rapid growth of algae which will in turn absorb atmospheric CO2 which in turn will create more oxygen.

Multiple problems solved.....

[Lurkina.n.Learnin]

Brilliant! You must have a PHD.

[Carriage Hill]

Red and brown algae tides are causing part of the problem, according to these people, in a 2005 article, which needs serious updating:

https://news.stanford.edu/news/2005/march16/gulf-030905.html