Earth had oxygen atmosphere 600 million years earler

http://www.livescience.com/39938-earth-had-oxygen-earlier.html

I wonder if that means the oxygen content 3 billion years ago was high enough so that, if you went back there in a time machine, you could comfortably breath the atmosphere and survive there without CO2 poisoning?

Originally posted by sonhouse
http://www.livescience.com/39938-earth-had-oxygen-earlier.html

Originally posted by RJHinds
The problem with their conclusions is that they are assuming the rocks are billions of years old instead of thousands of years old. But at least they are discovering that they have been wrong.

The Instructor

Originally posted by sonhouse
What will it take for YOU to discover you have been wrong for decades?

Originally posted by RJHinds
Who knows?

The Instructor