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ScienceDaily: Earth & Climate News |
| Changing ocean currents are driving extreme winter weather Posted: 20 Oct 2021 11:00 AM PDT Slower ocean circulation as the result of climate change could intensify extreme cold weather in the U.S., according to new research. |
| Europeans in the Americas 1000 years ago Posted: 20 Oct 2021 10:59 AM PDT The Vikings were active in North America in the year 1021 AD. This now represents the earliest -- and only -- known year in which Europeans were present in the Americas prior to the arrival of Columbus in 1492 AD. It also represents a definitive point in time by which the Atlantic Ocean had been traversed and human migration had finally encircled the globe. |
| Plugging into ocean waves with a flexible, seaweed-like generator Posted: 20 Oct 2021 10:58 AM PDT Ocean waves can be powerful, containing enough energy to push around sand, pebbles and even boulders during storms. These waves, as well as smaller, more gentle ones, could be tapped as a source of renewable energy. Now, researchers have developed flexible power generators that mimic the way seaweed sways to efficiently convert surface and underwater waves into electricity to power marine-based devices. |
| Urban wastes used as fertilizers contain higher PFAS than livestock manure Posted: 20 Oct 2021 05:38 AM PDT Because of their useful surfactant properties, per- and polyfluoroalkyl substances (PFAS) have been massively produced for non-stick coatings, water-repellant fabrics and firefighting foams. However, scientists have detected these highly stable 'forever chemicals' throughout the environment, prompting toxicity concerns. Now, researchers have characterized PFAS in contemporary and historical organic waste products applied to agricultural fields in France, finding the highest amounts in urban samples, with compounds changing over time. |
| Small-scale foragers left more than footprints on the landscape Posted: 19 Oct 2021 07:31 PM PDT Archaeological sites like the Great Wall of China and the pyramids can be seen with the naked eye from space, but for ancient societies that did not build, their traces on the landscape are more difficult to find. Now researchers have used satellite data to identify areas in coastal southwest Madagascar where indigenous foragers altered their surroundings. |
| How quickly does the climate recover? Posted: 19 Oct 2021 09:35 AM PDT It took the climate 20,000 to 50,000 years to stabilize after the rise in global temperatures of five to eight degrees Celsius 56 million years ago. Climate change today is causing temperatures to rise and is also increasing the likelihood of storms, heavy rain, and flooding -- the recent flood disaster in the Ahr valley in Germany is just one such example. What we need to ask ourselves in this connection is how quickly the climate can recover from the warming caused by an increase in carbon dioxide in the atmosphere. |
| 'Ray guns' let scientists use light instead of DNA to tell plant populations apart Posted: 19 Oct 2021 09:35 AM PDT Using a handheld device that looks a little like a ray gun, scientists recorded how plant leaves on different Alaskan mountains reflect light. And, it turns out, different populations of plants of the same species -- for instance, plants living on neighboring mountaintops -- reflect light differently, in ways that echo their genetic variation from each other. |
| More than 99.9% of studies agree: Humans caused climate change Posted: 19 Oct 2021 05:27 AM PDT More than 99.9% of peer-reviewed scientific papers agree that climate change is mainly caused by humans, according to a new survey of 88,125 climate-related studies. |
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