[[ Pdf ]] ⇮ Oxygen ↟ PDF eBook or Kindle ePUB free
This book describes current research on the history of oxygen in earth s atmosphere It was particularly good at conveying the collegiality of science and the way that data and conflicting hypotheses are built up, tested and rethought While written for the general public, reading it requires close attention I found it sobering that the tremendous quantities of cyanobacteria existing in the oceans were only discovered in 1979 since they were too small to be caught in the netting used to gather specimens Who knows what else is hiding in plain sight
[[ Pdf ]] ⇙ Oxygen ⇦ The Air We Breathe Is Twenty One Percent Oxygen, An Amount Higher Than On Any Other Known World While We May Take Our Air For Granted, Earth Was Not Always An Oxygenated Planet How Did It Become This Way Oxygen Is The Most Current Account Of The History Of Atmospheric Oxygen On Earth Donald Canfield One Of The World S Leading Authorities On Geochemistry, Earth History, And The Early Oceans Covers This Vast History, Emphasizing Its Relationship To The Evolution Of Life And The Evolving Chemistry Of The Earth With An Accessible And Colorful First Person Narrative, He Draws From A Variety Of Fields, Including Geology, Paleontology, Geochemistry, Biochemistry, Animal Physiology, And Microbiology, To Explain Why Our Oxygenated Earth Became The Ideal Place For LifeDescribing Which Processes, Both Biological And Geological, Act To Control Oxygen Levels In The Atmosphere, Canfield Traces The Records Of Oxygen Concentrations Through Time Readers Learn About The Great Oxidation Event, The Tipping Point Billion Years Ago When The Oxygen Content Of The Earth Increased Dramatically, And Canfield Examines How Oxygenation Created A Favorable Environment For The Evolution Of Large Animals He Guides Readers Through The Various Lines Of Scientific Evidence, Considers Some Of The Wrong Turns And Dead Ends Along The Way, And Highlights The Scientists And Researchers Who Have Made Key Discoveries In The FieldShowing How Earth S Atmosphere Developed Over Time, Oxygen Takes Readers On A Remarkable Journey Through The History Of The Oxygenation Of Our Planet I often complain about popular science books written by journalists, and how they often elide over many of the technical details, which is where the mystery and the beauty lie This book is kind of the opposite a working scientist who writes moderately well, but gets a little too lost in the details, Which in the end it makes me wonder who the intended audience is The subject, how did the Earth s atmosphere get to have so much free oxygen, is massive and inspiring, and there seem to be few people that are qualified to write this book than Canfield It is quite interesting, but I found myself far too often bogged down in the details, losing sight of the big picture he was trying to convey As such, it was of a slog than a delight I cannot help but compare with the bio chemistry books written by Nick Lane and wonder what makes the difference one was delightful and I have eagerly sought out subsequent work the other is interesting but something I probably won t pursue any further. When I first heard about Oxygen I immediately wanted to read it This is an amazingly important topic for understanding the history of life on Earth and it was written by a true renowned specialist, Prof Donald Canfield Although the positives hugely outweigh the negatives, such as the author s clear and precise use of language and the careful selection and exposure of data, there were some distracting features such as the oversimplification of relatively simple geological and biological processes I also think that some topics, such as the evolution of oxygenic photosynthesis, could have been developed further It would have added depth and length to a rather short book that left me wanting. InOxygen A Four Billion Year History, ecology professor Donald E Canfield recounts the history of Earth s atmosphere, focusing on one of the most important elements of life oxygen The author describes scientific theories around the oxygenation of our planet and their evolution precisely and in a very detailed manner This book is a bit technical than your typical popular science book, which I enjoy but it might not be everyone s cup of tea Nevertheless, it is a very informative book about a fascinating subject. Although this is a popular science book written for a general audience, there are a few technical spots Canfield does a superb job describing the great oxygen event and the subsequent reducing atmosphere that caused the great rusting or oxidizing event Banded iron formations are evidence of this The rise in oxygen brought an increase in biodiversity Canfield does an excellent job of detailing the history of oxygen on Earth. This might be better if you have a thorough chemistry background The topic was interesting, but the book was weighed down by chemical diagrams and reaction equations. Good book, by a student of Bob Garrels See notes.Sadly, it s due I ll have to get it back to finish it Too many books Set back to want to read for now.. This is a quite readable, and interesting, book by one of the world s leading authorities on geochemistry, earth history, and the early oceans It covers the evidence gathered over the last several decades and before concerning the evolution of Oxygen in Earth s atmosphere Other popular science accounts on this and related topics have given a detailed and maybe misleading account of the changes in the Oxygen content of the atmosphere, but Canfield is much conservative in his account of what happened, and when Up until about 2.4 billion years ago, there was virtually no Oxygen in the Earth s atmosphere At this point, the Great Oxygenation Event occured and free Oxygen first appeared in the Earth s atmosphere Between this point and the start of the Phanerozoic Eon 540 million years ago , it is extremely difficult to put numbers on the evolution of Oxygen in the atmosphere based on the geochemical evidence we have to date The most that Canfield will admit to is that Oxygen levels in the atmosphere during the early stages of the Phanerozoic Eon were in the range 10% to 20% of present atmospheric levels, and only displayed a significant increase during the Late Silurian and Early Devonian Periods some 420 million years ago There is considerable evidence of very high rates of oxygen liberation during the Carboniferous and early Permian Periods when atmospheric oxygen concentrations may have significantly exceeded modern levels What is particularly interesting in Canfield s account is how the evolution of the Oxygen content of the atmosphere and oceans interacted with other geophysical cycles including the carbon silicate weathering, phosphorus and nitrogen cycles If you have an interest in the modern understanding of Earth systems science, this book is well recommended. Negative and positive feedback mechanisms.