Late in the PreCambrian…

Explosive growth of life on Earth fueled by early greening of planet.

Explosive growth of life on Earth fueled by early greening of planet.

Was ancient Earth a green planet?.

Earth formed a Super-Continent, Rodinia, c. 1 Gya. Perhaps its emergence from beneath the waves encouraged plant-life to invade, because it did invade en masse and, perhaps, led to the collapse of the old methane greenhouse of the Proterozoic.

Once the Earth greened, then the stage was set for animals…

Dawn of the Animals: Solving Darwin’s Dilemma

…though it’s possible the animals encouraged the oxygen change that swept the world and, apparently, locked up the planet in glaciers a couple of times before animal fossils grew large and numerous.

Curious. Do all worlds spawn animal life in the same way? Is oxygen the secret ingredient? There are reasons to answer… ‘Maybe, yes.’