It also indicates that this same species would not even notice the relatively slow rate at which CO2 is increasing in the atmosphere today.
However, a number of other factors bring the ocean acidification hypothesis into question.Figure 2. https://www.scientificamerican.com/article/co2-levels-just-hit-another-record-heres-why-it-matters/9. Atmospheric CO2 levels have reached spectacular values in the deep past, possibly topping over 5000 ppm in the late Ordovician around 440 million years ago. Head Office: 27 Old Gloucester Street, London WC1N 3AX. https://royalsociety.org/topics-policy/projects/climate-change-evidence-causes/basics-of-climate-change/ “Those rapid global warming events were almost always highly destructive for life, causing mass extinctions such as at the end of the Permian, Triassic, or even mid-Cambrian periods.”Increased temperature did no such thing. These cookies do not store any personal information. More than 72% of our planet is covered by oceans with an average depth of more than 4 kilometers. This is higher (by far) than at any point in at least the last 800,000 years (CO2 levels have always went up and down between about 200 and 300ppm) 2. It is believed to have been present in Earth's first atmosphere, shortly after Earth's formation. Changes in CO2 levels may suggest that someone is losing or retaining normal body fluids. https://www.skepticalscience.com/print.php?r=775. Over the Earth’s history, atmospheric CO2 concentrations have ranged from 180 ppm to 7000 ppm, see Figure 1 below.
https://skepticalscience.com/climate-change-little-ice-age-medieval-warm-period-intermediate.htm13. The second atmosphere, consisting largely of nitrogen and CO 2 was produced by outgassing from volcanism, supplemented by gases produced during the late heavy bombardment of Earth by huge asteroids. The amount of Co2 today at just 400 ppm today pales in comparison with the past when there was more than 5000 ppm which is > 10 X as much! This is not the case. https://www.climatecentral.org/news/the-last-time-co2-was-this-high-humans-didnt-exist-1593815. Secondly, these species produce thousands to millions of offspring every time they reproduce. Oxygen in the atmosphere fluctuated from 15 to 35% during this period During the early life of the planet, the Earth was much hotter, and there was much more volcanic activity than there is today.The heat of the core caused carbon and oxygen to combine to form CO2, which became a significant part ofThis allowed these species to build hard shells of calcium carbonate (CaCO3) around their soft bodies, thus providingWhy, then, are we told that even at today’s much lower level, CO2 is already causing damage to calcifying speciesThe most common argument is along the lines of “today’s species of corals and shellfish are not adapted to the levelThis is nonsensical in that from a biochemical perspective there is no reason to believe these species have lost their ability to calcify at the higher CO2 levels that existed for millions of years in the past. https://en.wikipedia.org/wiki/Abrupt_climate_change6. The changes that have occurred to the Earth’s climate over the past 300 years since the peak of the Little Ice Age around 1700 are in no way unusual or unique in history.During the past 3,000 years, a blink in geological time, there has been a succession of warm periods and cool periods.
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