New Info from Ancient Rocks Upends Popular Theory
Roughly 2.5 to 2 billion years ago, the earth's surface experienced the biggest chemical change in its history when oxygen became abundant in the atmosphere, eventually leading to the evolution of complex life forms such as plants and animals that emerged half a billion years ago. During this first rise of oxygen, large quantities of microbial biomass were buried on the seafloor and locked carbon…
We haven't written up this one. Caltech News has the full story — the link below goes straight to it.
