Oxygen And Fires - How Vertebrates Colonized Land?

Variations in the Earth’s atmospheric oxygen levels may be closely linked to the evolution of life, with feedbacks between uni- and multicellular life and oxygen, say scientists from Royal Holloway, University of London and from The Field Museum in Chicago.    Writing in Nature Geoscience, they say over the past 400 million years, the level of oxygen has varied considerably from the 21% value we have today and the amount of charcoal preserved in ancient peat bogs, now coal, gives a measure of how much oxygen there was in the past. read more

Read the whole article on

More from