--Posted By johannes to <http://www.monochrom.at/english/2008/10/when-did-earth-turn-green.htm>monochrom at 10/23/2008 06:14:00 PM
Photosynthesis was thought to have evolved by 2.7
billion years ago â but it seems the original evidence was contaminated.
<http://www.newscientist.com/article/dn15022-when-did-the-earth-turn-green.html?DCMP=ILC-hmts&nsref=news1_head_dn15022>Link
