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Thread: Global Dimming

  1. #1 Global Dimming 
    Forum Cosmic Wizard icewendigo's Avatar
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    Global Dimming

    In a nutshel, there's less sunlight reaching us...

    ... air pollution is reducing sunlight (interfering with evaporation/clouds reflectivity) much more than most scientists have known

    this is causing serious climat problems by itself
    but
    its also cooling the earth and concealing by how much Green House Gas is really heating up the earth

    heres the report

    http://video.google.co.uk/videoplay?...bal+Dimming%22

    (the presentation is a bit over the top with scary music for the sake of entertainment drama but the information is interesting)


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  3. #2  
    WYSIWYG Moderator marnixR's Avatar
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    wasn't there a report that after 9/11 when all the planes were grounded over the US, the skies cleared within a matter of days ?


    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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  4. #3  
    Forum Ph.D. Cat1981(England)'s Avatar
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    Thanks for providing the link.

    Having watched it, it seemed to me to be another show on the extreme end of the GW argument. All it seemed to be was speculation with dramatic music (as you pointed out) and a long buildup to pictures of glaciers melting. It would be nice to see a fair and equal, non-patronising show with solid facts and discussions from both sides about GW. This only go's to show our lack of understanding about the climate.
    I.E. to many ifs and buts.
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  5. #4  
    WYSIWYG Moderator marnixR's Avatar
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    the whole global warming debate highlights the limitations of science in proving something when sufficient knowledge is lacking

    even if you accept that most of the CO2 is anthropogenic and that this contributes to global warming, it's still a big step before the predictions following from these 2 premises can be taken as proven - the best you can say is that we're doing a large-scale uncontrolled experiment on the earth's atmosphere, outcome uncertain

    after all, remember the 70s when the doomsday scenario was 'the next ice age is due any minute' ?
    or the Club of Rome who confidently predicted that by the year 2000 we would have run out of a number of strategic metals ?
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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  6. #5  
    Forum Ph.D. Cat1981(England)'s Avatar
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    Quote Originally Posted by marnixR
    after all, remember the 70s when the doomsday scenario was 'the next ice age is due any minute' ?
    Thankfully, no.

    ----------

    It is a problem. But to be fair to the UN report and other scientific reports that have tryed to bring together all the information, none of them has said that global warming IS man made, only that it is highly likely to be man made. The periods of 50's, 60's and 70's when the global temp's dropped have been explained by certain gases we released. The problem is the media who can sensationalise anything they like and have no responsibility except for their tv ratings.
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  7. #6  
    Red
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    Your a few years too late on this subject global dimming a result of carbon dust ect not co2. When this dimming was discovered filters were fit and dimming was on the decrease and is now releatively solved but it has caused more damage than aid to our enviroment. Dimming and warming were working in equal measure cancelling there effect on the world until it was irradicated ruining this equilibrium letting warming take over. Dimming is no longer a problem now we must concentrate on the problem of warming as we did the ozone layer and dimming even with all these scaremongers i think we will eventually crack this one.
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  8. #7  
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    Although there is a problem, people like to make things bigger than they actually are. Nobody cares about the little things, only the big things. All this global warming and dimming stuff matters but the numbers are biased.
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  9. #8  
    WYSIWYG Moderator marnixR's Avatar
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    Quote Originally Posted by shawngoldw
    ... but the numbers are biased.
    says who ?
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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  10. #9  
    Universal Mind John Galt's Avatar
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    I've always thought of global dimming to be a nice description of the intellects of the ostriches who doubt global warming.
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  11. #10  
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    Quote Originally Posted by marnixR
    Quote Originally Posted by shawngoldw
    ... but the numbers are biased.
    says who ?
    Well different people use different stats, for instance Al Gore and his An Inconvientient Truth have different numbers and predictions than I have seen in other places.
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  12. #11  
    WYSIWYG Moderator marnixR's Avatar
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    Quote Originally Posted by shawngoldw
    Well different people use different stats, for instance Al Gore and his An Inconvientient Truth have different numbers and predictions than I have seen in other places.
    how different ? enough to invalidate the conclusions ?
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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  13. #12  
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    no. I'm not disagreeing with global warming at all. I 100% believe it is true. I'm just saying that people are always looking for something big to worry about
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  14. #13  
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    Average heat reaching the sun per unit time=pi*Re^2*(1-a)Cs.

    Re=radius of earth=6371 km
    Cs=solar constant=1370 Wm^-2
    a=albedo

    You wanna cool the earth, simply increase a. It's the easiest way. Global dimming seems a strange name to attribute to an increase in reflectivity but each to their own I guess.
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  15. #14  
    Forum Ph.D. Cat1981(England)'s Avatar
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    Maybe, but 'Global dimming' is a much cooler name.

    Sorry.
    Eat Dolphin, save the Tuna!!!!
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  16. #15  
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    Anyone notice my dumb mistake a couple posts up?

    Alochol and science are a doomed combination. I guess another thing that can change though is Cs, with Milankovic and solar cycles Cs is actually not a fixed constant. Whereas pi and Re are fixed through.
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  17. #16  
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    Anyone notice my dumb mistake a couple posts up?

    Alochol and science are a doomed combination. I guess another thing that can change though is Cs, with Milankovic and solar cycles Cs is actually not a fixed constant. Whereas pi and Re are fixed through.
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