An interesting new determination of Earth’s CO2 level over the past 2.5 million years (Texas A&M University). This study, released on Sept. 25, has not been widely publicized, perhaps because the methods used were so new to science and the result so unique. The main conclusion: “In 1965, Earth’s carbon dioxide atmospheric concentrations exceeded 320 parts per million, a high point never reached in the past 2.5 million years…..Our reconstructions show that for the entire Pleistocene period, carbon dioxide averaged around 250 parts per million, which is the same as the last 800,000 years’ values.” The results of the method are said to match everything known with reasonable certainty from all the different studies of Antarctic ice, including a few “snapshots” of very old blue ice fragments, but vary on the low side from a number of other ways of doing old CO2 estimates.
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–You can read the entire paper at this link, showing comparisons with other methods used to reveal CO2 history. This methodology could have legs, and I hope to hear about prospects for testing Chinese loess soils that are older yet, if they are viable.
–Also, I want to thank Tim Radford for alerting us to this important study at the Climate News Network website, which has an analysis of something new every day, always worth reading.
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Cold and snowy conditions provide value that is greatly missed when absent (University of New Hampshire). From a new study, “Winter conditions are changing more rapidly than any other season and it could have serious implications.” Researchers have detailed the changes over the past 100 years and the problems that have been realized in the ecologies of northern forests.
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A new State of Nature report examines the current state of extinction threats in the UK (BBC News). The authors claim to know more about the details of UK wildlife than what is known in any other country, keeping track of more than 7000 species through the work of more than 70 different agencies and organizations. This story has many specific numbers, and they are troubling. For example, more than a quarter of UK mammals now face extinction.
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Last month was equal to the hottest September on record (Phys.org). That’s according to satellite data from the EU. “The data continues Earth’s hot streak, with June being the warmest June ever, July the warmest month in recorded history. August was the second hottest August since records began.”
Carl