Earth's oceans may have displayed a very different color several billion years ago. This hypothesis emerges from a recent ...

But while lifeless during that time, the planet was already covered by vast oceans dotted with hydrothermal vent systems that ...

High Archean climatic temperatures inferred from ... The early evolution of eukaryotic organisms: A geological perspective. Science 256, 922–627 (1992). Kreidenweis, S. M.