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Widdekind
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According to the History Channel documentary How the Earth was Made (DVD), Earth's early oceans were green, b/c of their (different) chemical composition. For example, they had more dissolved Iron, and CO2.
CONCLUSION: Earth Early Lifeforms were confined to the Oceans, for lack of an Ozone Layer to shield against DNA-damaging UV. If those Oceans reflected Green light (hence, looked green), then marine Photo-Synthesizers well under the surface could not have absorbed any green photons. Instead, they would have evolved to absorb all other frequencies... and hence, look "green" just like the early Oceans they evolved in, as their Absorption Spectrum would resemble the Transmissivity (sp?) of the archaic Oceans.
IMAGE of CHLOROPHYLL ABSORPTION SPECTRUM: http://bp0.blogger.com/_qiUMQxM9rCg...0GiQmIdyk-A/s1600-h/070410_light_graph_02.jpg
CONCLUSION: Earth Early Lifeforms were confined to the Oceans, for lack of an Ozone Layer to shield against DNA-damaging UV. If those Oceans reflected Green light (hence, looked green), then marine Photo-Synthesizers well under the surface could not have absorbed any green photons. Instead, they would have evolved to absorb all other frequencies... and hence, look "green" just like the early Oceans they evolved in, as their Absorption Spectrum would resemble the Transmissivity (sp?) of the archaic Oceans.
IMAGE of CHLOROPHYLL ABSORPTION SPECTRUM: http://bp0.blogger.com/_qiUMQxM9rCg...0GiQmIdyk-A/s1600-h/070410_light_graph_02.jpg
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