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Des excréments de chauves-souris témoins de plus de quatre mille ans d histoire

Des excréments de chauves-souris témoins de plus de quatre mille ans d histoire
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Warming Trends: Google Earth Shows Climate Change in Action, a History of the World Through Bat Guano and Bike Riding With Monarchs

Warming Trends: Google Earth Shows Climate Change in Action, a History of the World Through Bat Guano and Bike Riding With Monarchs A column highlighting climate-related studies, innovations, books, cultural events and other developments from the global warming frontier. Related An updated Google Earth feature shows climate change in action over the last four decades. Launched in collaboration with U.S. and European government agencies, Google Earth Timelapse contains 37 years worth of changes to Earth’s surface, many related to the climate crisis.  In the Amazon, for example, the tool shows large swaths of forest traded for cattle ranches and soybean farms. In Greenland and Antarctica, users can see miles-long glaciers quickly melting away. Wildfire smoke fills the skies above Alberta, Canada; the coast of the Bahamas is devastated by a hurricane; and the Aral Sea in Kazakhstan loses 90 percent of its surface area in a matter of decades.

Mound of 4,300-year-old bat guano reveals ancient history of Jamaica

Experts scooped out four-inch slices of guano from a pile more than six feet tall Biochemical markers reveal shifts in the bats diet over thousands of years They were able to mark dry periods in 1350 BC and during the Middle Ages Chemical signatures from nuclear testing and leaded gasoline were also found The guano at the top was so wet, samples had to be taken with an eyedropper

4,300 Years of Bat Poop From The Depths of a Jamaican Cave Have Revealed Earth s Past

4,300 Years of Bat Poop From The Depths of a Jamaican Cave Have Revealed Earth s Past 14 APRIL 2021 You may not give a pile of bat poop gathered over 4,300 years a second look – but to a group of scientists, it s provided an intriguing insight into how bat diets and therefore climate conditions have shifted over thousands of years.   Taller than the average man (2 meters or 6-and-a-half feet), the pile of poop (also known as guano) records history in clear layers, much like sediments under a lake. By analyzing the layers back through time, the scientists have been able to figure out changes in the diets of the bats that have been inhabiting this cave for millennia.

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