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Global Warming or Ice Age?

  1. Mar 1, 2009 #1
    Does anyone else believe that we are not going through global warming but actually and ice age?
     
  2. jcsd
  3. Mar 1, 2009 #2

    baywax

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    Please post some of the reports or papers that have led you to ask this question.
     
  4. Mar 2, 2009 #3

    baywax

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    It depends on who you listen to and what you read.


    http://www.aip.org/history/climate/solar.htm

    (this site has some great background on the discovery of "global warming")


    http://www.whoi.edu/page.do?pid=12455&tid=282&cid=10046

    So you might say that both "global warming" and "global freezing" are inevitable. We may have made the interglacial period a little warmer this time around but, generally, there's no stopping the warming and cooling of our planet because it is stuck on the 26,000 year long carousel ride of precession.
     
    Last edited by a moderator: Mar 3, 2009
  5. Mar 3, 2009 #4
    I agree with the quote of the expert above who states that the 1,470 year cycle of abrupt warming and cooling needs a full explanation before any attempt at forecasting can be made. http://209.85.229.132/search?q=cach...storf+(2003).+timing&hl=en&ct=clnk&cd=5&gl=uk (click on html version at the top and view figure 1).
     
    Last edited by a moderator: Apr 24, 2017
  6. Mar 3, 2009 #5
    It should be noted that these D-O events (tied to 1470 years quasi-periodicity) and Heinrich events have not occurred during the Holocene interglacial. They appear to be a feature of glacial periods rather than interglacials. The yet to be determined "trigger" may still occur, especially if of orbital origin.

    http://www.ncdc.noaa.gov/paleo/abrupt/images/data3-gisp2-icecore.gif

    http://www.ncdc.noaa.gov/paleo/abrupt/data3.html"
     
    Last edited by a moderator: Apr 24, 2017
  7. Mar 3, 2009 #6
    I have a hunch that the 1,470 year cycle is a permanent feature of the inner core acting dynamically against the fluid outer core. It could be thought of as the internal orbit of the inner core due to irregularities in formation.
     
  8. Mar 3, 2009 #7

    Monique

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    I want to remind everyone of our https://www.physicsforums.com/showthread.php?t=280637"
     
    Last edited by a moderator: Apr 24, 2017
  9. Mar 4, 2009 #8
    This sciencemag article shows that there is still a lot about the inner core which we are just beginning to find out about Inner Core Differential Motion Confirmed by Earthquake Waveform Doublets
     
  10. Mar 6, 2009 #9
    Also, check out this interesting article newscientist: Different Gravity
     
  11. Mar 6, 2009 #10
    Global warming is a step in the Ice Age. Sounds ironic, but true...
     
  12. Mar 6, 2009 #11
    In this forum it is very important to use formal sources for claims like that
     
  13. Mar 7, 2009 #12
    In order to prove that we are heading into an ice age with global temperatures rising?
     
  14. Mar 24, 2009 #13
    We have entered a new climate epoch known as the http://en.wikipedia.org/wiki/Anthropocene" [Broken]

    There is very little chance that the Earth will enter a new glacial epoch as long as humans are around. Even with extreme cutbacks in GHG emissions human activity will still provide enough positive loading of the carbon cycle to maintain a temperate to tropical Earth for at least the next million years.
     
    Last edited by a moderator: May 4, 2017
  15. Mar 24, 2009 #14

    Xnn

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    Be careful; a million years is a long time.

    Yellowstone National Park will likely erupt before then.
    Even without that, after fossil fuels are exhausted, it will likely take less than 100,000 years for CO2 levels to lower significantly.
     
  16. Mar 24, 2009 #15
    As long as we are manufacturing refrigerants that get released into the atmosphere the enhanced greenhouse effect will overwhelm orbital forcings.

    Humans will not allow another ice age to occur if they can help it, and they can. If the Yellowstone caldera blows there may no longer be a human civilization. So perhaps I should have said as long as human civilization exists the probability of another glaciation occuring is very remote.
     
  17. Mar 25, 2009 #16

    Xnn

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    At present rate of consumption, there is only about 150 years of fossil fuel reserves. While CO2 levels are currently going up around 2 ppm/year, that is not sustainable forever.

    CO2 levels are currently 386 ppm. Add another 300 ppm (2*150) and the maximum is around 686 ppm. After that, levels should start to decline. We could burn everything that grows, but since plants remove CO2 from the atmosphere, that in itself won't raise CO2 levels. Of course, there is also production of cement, but the economics aren't as lucrative.

    Without fossil fuels, I just don't see how we can economically keep CO2 levels elevated. In a few hundred years, levels will stabilize and then start falling. Not sure how fast, but within a few thousand years, CO2 could be below 200 ppm and with the perihelion still in January, that's a recipe for growing continental ice sheets. Maybe not a full scale ice age, but enough to be a concern.
     
  18. Mar 25, 2009 #17
    Maybe there are ways we can do reverse sequestering.
     
  19. Mar 25, 2009 #18
    Last edited by a moderator: Apr 24, 2017
  20. Mar 26, 2009 #19
    Fossil fuels are not the only source of GHGs, nor are they the most potent. HFC's have a GWP of ~10,000.

    http://www.epa.gov/highgwp/scientific.html [Broken]
     
    Last edited by a moderator: May 4, 2017
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