Because the Phanerozoic eon covers a wide swath of Earth's ... slowly than the climate change we're experiencing now. Earth's ...

The new curve reveals that Earth's temperature has varied more than previously thought over much of the Phanerozoic Eon, the past 540 ... Technique Averaged Surface Temperature Integrated Curve ...

The Proterozoic eon was the gathering up of oxygen in Earth's atmosphere, and the Phanerozoic eon coincides with the major diversification of animals, plants, and fungi.