Title : Current Rate Of Increase In Atmospheric Carbon Is The Largest Since The Time Of The Dinosaurs
link : Current Rate Of Increase In Atmospheric Carbon Is The Largest Since The Time Of The Dinosaurs
Current Rate Of Increase In Atmospheric Carbon Is The Largest Since The Time Of The Dinosaurs
id = " about 56 million years ago, there was a massive release sudden carbon into the atmosphere, which caused the temperature of the planet to peak - an event that has become known as the Paleocene-Eocene thermal maximum (PETM). Researchers have used this as an analog to help understand how the current increase in atmospheric CO 2 could affect our climate. But now it seems that the PETM was just a blip compared to the speed at which we are currently emitting carbon.
By analyzing sediment provided at the bottom of the oceans when the PETM began, researchers have been able to find out how much carbon was released during the event, and how quickly. They found it took about 4,000 years, with about 0.6 to 1.1 million tonnes (0.7 to 1.2 bllion tons) of carbon per year are released during the PETM reaches its maximum. At this point, the global atmospheric carbon was established in about 1000 parts per million, causing global temperatures to rise by 5 ° C (8 ° F). By contrast, humans are now emitting about 40 million tons (44 million tons) of CO 2 per year, with the amount of carbon in the atmosphere and tilt 400 parts per million. Published in the journal Nature Geoscience, research shows that carbon release during the PETM was very little of what we are currently running, which means that all the conclusions that it will be limited to the situation of today's applications. While it is believed that life on earth got through MTPE relatively unscathed, although there is no evidence that mammals changed their migration north to stay within his belt preferred temperature, in life ocean fared worse. The increase in CO atmosphere 2 caused acidity increase, adversely affecting coral and causing the mass extinction of small deep-sea creatures known as "forams." 
The sediment sample. The red band marks the PETM in about 56 million years ago. James Zachos "For all we know, the PETM has the highest carbon release during the last 66 million years," says Richard Zeebe, who co-authored the paper, in a release. However, even a natural event of this scale might not be able to tell us much. "Because our carbon release rate is unprecedented in a period so long in the history of the Earth, it also means we have actually entered a" not-to-analog '. This represents a major challenge for the projection of climate change in the future because we have a good comparison with the past. " What exactly caused the PETM remains a matter of debate, meteor to massive leakage of methane to a combination of these things. This study does not attempt to answer this, but simply looks at the result of it. During the period after the event, there were massive changes in surviving animals and evolution . all ecosystems But now it seems that they also had a period of time during which adapt much longer - thousands of years -. in comparison with the current event that we are going, what is happening in just a hundred (source)
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