archean

What did we breathe back then?

If we were there, ‘back then’, that is… A new study supported by the NASA Astrobiology Institute (NAI) has revealed details about the composition of Earth’s atmosphere during the Archean eon, which occurred roughly 4…


An ancient greenhouse?

Here’s a climate puzzle — one that goes back to Earth’s infancy some 4.5 billion to 2.5 billion years ago. The sun was much dimmer back then. Far less solar radiation reached the planet. Earth…