Some scientists now believe the first complex animals on earth may have appeared some 890 million years ago in the form of sponges.
The Deccan Traps spewed toxins and greenhouse gases for 700,000 years. The Chicxulub asteroid impact near the Mexican, Yucatán peninsula was the coup de grâce for an already weakened biosphere.
If we time-traveled back 1.8 billion years, the world would certainly not“seem the same”. The apex of life consisted of single-celled slime floating in ancient oceans.
The middle Pliocene is our closest analog to present-day greenhouse gas levels. It provides a probable peek into our future — several more degrees of global temperature rise and many meters of sea-level rise.
Oxygen was disappearing from the atmosphere for a billion years, Why?
The first ecosystems in geological history, wiped out by oxygen