Algae/cyanobacteria blooms are already a reality [1]. The ocean is such a big system though, that I wouldn't expect the long-term effects of these blooms to be

Algae/cyanobacteria blooms are already a reality [1]. The ocean is such a big system though, that I wouldn't expect the long-term effects of these blooms to be observable in a timeframe measured in decades. [1] http://blogs.smithsonianmag.com/smartnews/2013/07/chinas-massive-algae-bloom-could-leave-the-oceans-water-lifeless/ http://blogs.smithsonianmag.com/smartnews/2013/07/chinas-mas...