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  • Kansas Legislator Proposes Bill to Outlaw Sustainability Education
    A bill has been introduced in the Kansas legislature this week that would prohibit the promotion of ...Read more

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    Kansas Legislator Proposes Bill to Outlaw Sustainability Education

    A bill has been introduced in the Kansas legislature this week that would prohibit the promotion of sustainability. Here is a link to the one-page bill: http://www.kslegislature.org/li/b2013_14/measures/documents/hb2366_00_0000.pdf. See report on Bloomberg News.
  • Earth's Center Is 1,000 Degrees Hotter Than Previously Thought, Synchrotron X-Ray Experiment Shows
    Scientists have determined the temperature near the Earth’s center to be 6000 degrees Celsius, 1000 ...Read more

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    Earth's Center Is 1,000 Degrees Hotter Than Previously Thought, Synchrotron X-Ray Experiment Shows

    Scientists have determined the temperature near the Earth’s center to be 6000 degrees Celsius, 1000 degrees hotter than in a previous experiment run 20 years ago. These measurements confirm geophysical models that the temperature difference between the solid core and the mantle above, must be at least 1500 degrees to explain why the Earth has a magnetic field. For more information about this study, see the press release from the European Synchrotron Radiation Facility.
  • Ocean Volcanic Rocks Contain Samples of Recycled Crust
    Scientists have long believed that lava erupted from certain oceanic volcanoes contains materials fr...Read more

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    Ocean Volcanic Rocks Contain Samples of Recycled Crust

    Scientists have long believed that lava erupted from certain oceanic volcanoes contains materials from the early Earth’s crust. But decisive evidence for this phenomenon has proven elusive. New research from a team including Carnegie’s Erik Hauri demonstrates that oceanic volcanic rocks contain samples of recycled crust dating back to the Archean era 2.5 billion years ago. Their work is published in Nature. Oceanic crust sinks into the Earth’s mantle at so-called subduction zones, where two plates come together. Much of what happens to the crust during this journey is unknown. Model-dependent studies for how long subducted material can exist in the mantle are uncertain and evidence of very old crust returning to Earth’s surface via upwellings of magma has not been found until now. For more information about these results, see the press release from the Carnegie Institution.
Hunters in the Snow by Pieter Breughel. Breughel captured the long winters of the Little Ice Age in this 1565 painting.
Click on image for full size
Caspar Ammann

The Little Ice Age

From about 1250 to 1850 temperatures were a bit colder than usual in most parts of the world. This time is called the Little Ice Age.

During the Little Ice Age, the average temperature of the planet was about a degree Celsius cooler than it is today (that’s 2-3 degrees Fahrenheit). Scientists think that the planet was cooler because there was less solar activity and more erupting volcanoes. The Little Ice Age was not a true ice age because it did not get cold enough for long enough to cause ice sheets to grow larger. The cooling likely affected areas around the world but we have the most records of how it changed daily life from Europe. Listed below were some of the things we know happened during the Little Ice Age.

  • Fur trappers reported that southern Hudson Bay remained frozen for about 3 weeks longer each spring.
  • Fishermen reported large amounts of sea ice floating in the North Atlantic.
  • British people saw Eskimos paddling canoes off the coast of England.
  • Alpine (mountain) glaciers grew larger.
  • Winters were longer and growing seasons shorter according to tree ring data and records of cherry tree flowering.
  • Wet weather caused disease that affected people, animals and crops including the plague. The plague is also called the Black Death. It was a disease that killed more than a third of Europeans.
  • Because farmers couldn’t grow food, people went hungry in areas of northern and Eastern Europe. Unlike today, there was no way to transport food from far away.
Last modified June 20, 2008 by Lisa Gardiner.

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