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E.g., 08/17/2019
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Your search has returned 2169 articles:
  • News

    Fluid in superdeep diamonds may be from some of Earth's oldest unchanged material

    A surprisingly hardy reservoir of rock left over from just after Earth’s formation still lurks deep inside the planet, according to a new analysis of superdeep diamonds.

    Fluid trapped inside these diamonds, forged hundreds of kilometers underground in Earth’s mantle, bears the chemical signatures of rock that has remained relatively undisturbed for billions of years. This holdout of...

    08/15/2019 - 14:00 Earth, Chemistry
  • News

    The worst wildfires can send smoke high enough to affect the ozone layer

    For the first time, scientists have seen exactly how towering clouds that rise from intense wildfires launch smoke high into the atmosphere, where it can linger for months and mess with the protective ozone layer.

    Cooler air closer to Earth’s surface normally keeps smoke from rising too high. But as dozens of fires raged in western Canada and the U.S. Pacific Northwest in the summer of...

    08/08/2019 - 14:00 Climate, Earth
  • News in Brief

    One in 4 people lives in a place at high risk of running out of water

    The world is facing a water scarcity crisis, with 17 countries including India, Israel and Eritrea using more than 80 percent of their available water supplies each year, a new analysis finds. Those countries are home to a quarter of the world’s 7.7 billion people. Further population rise or dwindling water supplies could cause critical water shortages, the researchers warn.

    “As soon as...

    08/08/2019 - 06:00 Earth
  • Feature

    With nowhere to hide from rising seas, Boston prepares for a wetter future

    Boston dodged a disaster in 2012. After Hurricane Sandy devastated parts of New Jersey and New York, the superstorm hit Boston near low tide, causing minimal damage. If Sandy had arrived four hours earlier, many Bostonians would have been ankle to hip deep in seawater.

    Across the globe, sea levels are rising, delivering bigger storm surges and higher tides to coastal cities. In Boston,...

    08/06/2019 - 06:00 Climate, Earth, Science & Society
  • News

    How the 5 riskiest U.S. cities for coastal flooding are preparing for rising tides

    The five U.S. cities most at risk from coastal flooding have begun to make plans for adapting to rising sea levels. Some are further along than others. Here’s where their flood resilience efforts stand:

    Miami

    Florida’s flooding risk comes not just from storms and high tides but also from water seeping up through the porous limestone that underlies much of the state. After 2017’s...

    08/06/2019 - 06:00 Climate, Earth, Science & Society
  • Science Visualized

    A new map is the best view yet of how fast Antarctica is shedding ice

    Decades of satellite observations have now provided the most detailed view yet of how Antarctica continually sheds ice accumulated from snowfall into the ocean.

    The new map is based on an ice-tracking technique that is 10 times as precise as methods used for previous Antarctic surveys, researchers report online July 29 in Geophysical Research Letters. That offered the first comprehensive...

    08/05/2019 - 08:00 Earth, Climate
  • News

    Decades of dumping acid suggest acid rain may make trees thirstier

    A forest watered by acid rain may be less able to slake its thirst.

    That’s one finding from a decades-long experiment in the Appalachian Mountains, where the U.S. Forest Service since 1989 has been dousing a 34-hectare patch of forest with an acidifying ammonium sulfate fertilizer three times a year. The chemical served as a proxy for acid rain, which is created when sulfur and nitrogen...

    08/05/2019 - 06:00 Earth, Ecosystems, Pollution
  • News

    The Arctic is burning and Greenland is melting, thanks to record heat

    The Arctic is on fire. Record-breaking temperatures and strong winds are fueling an unprecedented number of wildfires across the region this summer. In Siberia alone, hundreds of wildfires captured by satellite images July 28 spanned about 3 million hectares of land. Across Alaska, as many as 400 wildfires were burning as of mid-July. And the heat is also melting Greenland’s ice at an alarming...

    08/02/2019 - 15:52 Climate, Earth
  • News in Brief

    U.S. wells are pumping up groundwater from increasing depths

    Residential, agricultural and industrial wells are being dug deeper and deeper in search of freshwater, according to the first nationwide assessment of U.S. groundwater wells. But scientists warn that the practice is not a sustainable way to address the country’s future water supply needs.

    In the United States, groundwater is a source of drinking water for more than 120 million people...

    07/23/2019 - 06:00 Earth
  • Science Visualized

    Night-shining ‘noctilucent’ clouds have crept south this summer

    High in the sky, sunlit wisps remain aglow even after sundown. This summer, a surprising number of such noctilucent, or “night-shining,” clouds have been spotted in the Northern Hemisphere — and, unusually, as far south as Oklahoma and New Mexico, scientists report.

    These clouds typically float in the mesosphere about 80 kilometers above Earth’s surface, and are visible at high latitudes...

    07/16/2019 - 10:00 Earth, Climate, Planetary Science