Earth's oceans may have been green for billions of years until the first photosynthetic organisms flooded our atmosphere with ...

Berlin: Ethan Hawke and Richard Linklater on their new film 'Blue Moon,' in which Hawke plays American lyricist Lorenz Hart.

Some cyanobacteria have pigments that specialise in harvesting green light to power their photosynthesis, which may be an evolutionary adaptation to a time when the oceans were iron-rich and green-tin ...