O2??? I'm not a scientist, but isn't that oxygen? Plankton is producing more oxygen than the trees and other plants on the earth? I realize that the oceans make up most of the planet, but is there some scientific source showing that Plankton are the "big producers?" Also, with all the CO2 that we are supposedly producing, including through humans exhaling, doesn't that just give the plants more with which to produce oxygen?
Pretty much explains it all:
http://news.nationalgeographic.com/news/2004/06/0607_040607_phytoplankton.html