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    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong correlation between the occurrence of volcanic eruptions and extreme cold weather in Ireland over a 1200 year period. Data analyzed in this study cover the period from 431 to 1649, during which time up to 48 volcanic eruptions are identified in Greenland ice core records through deposition of volcanic sulfate in annual layers of ice. You can find the study (open access), published on 6 June 2013 in IOP Publishing's journal Environmental Research Letters, at http://iopscience.iop.org/1748-9326/8/2/024035/article. Find out more about how volcanoes can influence climate.
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    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm rep...Read more

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    Atmospheric CO2 Level Tops 400 ppm

    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For more on the Keeling Curve, see http://keelingcurve.ucsd.edu/. Find out more about greenhouse gases and warming.
This map shows the general area where Native American tribes lived. Please note that this is not a comprehensive map of all Native American tribes, but it does show the location of those tribes that will be discussed in fuller detail.
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Native American Astronomy

People from Asia crossed the Bering Strait into North America. These people were first in this new land and so they are known as Native Americans.

Over time, these people broke into tribes (as seen on the map). A lot of the tribes held similar thoughts about the sky and the heavens.

One thing that most of the tribes of North America held sacred was the four cardinal directions: north, east, south and west. Many tribes based their building architecture or city layout on these four cardinal directions.

Another common trend among Na tive American tribes was the fact that people weren't interested in time for the sake of time itself. There were no clocks or calendars. And so time was told by the ebb and flow of tides, by the ripening of the strawberries, by the Sun's position in the sky, by watching stars rise and fall, or by knowing when the bears wake from hibernation. Native Americans did track and name the lunar cycles (say from one ne w moon to the next). In fact, the first signs of skywatching among the Native Americans are rocks and bones that have scratches that corresponded with the lunar cycle. Lunar cycles were named after what was happening at the time. For instance, one tribe named one lunar cycle "laying geese" and another cycle "coming caribou".

These are just some common threads between the tribes of North America. Let's look at some specific tribes and regions to get a fuller picture. The Skidi Band of the Pawnee tribe are often seen as the most sophisticated starwat chers. The stars for the Chumash of California were gods who interacted in the life of people on Earth. The Zuni of the Southwest were avid trackers of the movement of the Sun. And the area of Chaco Canyon is filled with evidence of sophisticated astro nomical activity.

Last modified September 8, 2000 by Jennifer Bergman.

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