Good for plants?

Discussion in 'Environment' started by Old Rocks, Aug 28, 2010.

  1. Old Rocks
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    Old Rocks Diamond Member

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    Knight Science Journalism Tracker Blog Archive A climate change tipping point: Plant growth, once boosted by warming and increased CO2, may now be declining

    A climate change tipping point: Plant growth, once boosted by warming and increased CO2, may now be declining


    Global climate change, as many have observed, is a story that does not break; it oozes. Yet in today’s Science comes a climate change story that does, in a sense, break. To wit: the increased plant productivity caused by warming temperature, increased carbon dioxide and shifting rainfall pattterns has run out and the curve has reversed slope. Whereas plant productivity–the amount of atmospheric carbon taken up by plants–increased by about 6 percent during the 1980s and ’90s, it has since fallen by about 1 percent.
     
  2. Old Rocks
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    Old Rocks Diamond Member

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    Science shocker: Drought drives decade-long decline in plant growth Climate Progress

    That’s from a remarkable NASA news release today, “Drought Drives Decade-Long Decline in Plant Growth” (see narrated video below).

    On Friday, the journal Science publishes the study itself, ” Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009” (subs. req’d), which found:


    Terrestrial net primary production (NPP) quantifies the amount of atmospheric carbon fixed by plants and accumulated as biomass. Previous studies have shown that climate constraints were relaxing with increasing temperature and solar radiation, allowing an upward trend in NPP from 1982 through 1999. The past decade (2000 to 2009) has been the warmest since instrumental measurements began, which could imply continued increases in NPP; however, our estimates suggest a reduction in the global NPP of 0.55 petagrams of carbon. Large-scale droughts have reduced regional NPP, and a drying trend in the Southern Hemisphere has decreased NPP in that area, counteracting the increased NPP over the Northern Hemisphere. A continued decline in NPP would not only weaken the terrestrial carbon sink, but it would also intensify future competition between food demand and proposed biofuel production.
     
  3. Old Rocks
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    Old Rocks Diamond Member

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    Science shocker: Drought drives decade-long decline in plant growth Climate Progress

    That’s from a remarkable NASA news release today, “Drought Drives Decade-Long Decline in Plant Growth” (see narrated video below).

    On Friday, the journal Science publishes the study itself, ” Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009” (subs. req’d), which found:


    Terrestrial net primary production (NPP) quantifies the amount of atmospheric carbon fixed by plants and accumulated as biomass. Previous studies have shown that climate constraints were relaxing with increasing temperature and solar radiation, allowing an upward trend in NPP from 1982 through 1999. The past decade (2000 to 2009) has been the warmest since instrumental measurements began, which could imply continued increases in NPP; however, our estimates suggest a reduction in the global NPP of 0.55 petagrams of carbon. Large-scale droughts have reduced regional NPP, and a drying trend in the Southern Hemisphere has decreased NPP in that area, counteracting the increased NPP over the Northern Hemisphere. A continued decline in NPP would not only weaken the terrestrial carbon sink, but it would also intensify future competition between food demand and proposed biofuel production.
     
  4. CrusaderFrank
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    CrusaderFrank Diamond Member

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  5. AllieBaba
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    AllieBaba BANNED

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    Yeah, most of what I've heard (including from Nasa) has said there's more to worry about from global cooling than global warming, and I think that's where we're headed.
     
  6. RetiredGySgt
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    RetiredGySgt Platinum Member

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    Can't be cause man is destroying millions of acres of rain forest. Nope can not be that.

    By the way, warming trends were supposed to cause more rain, more hurricanes and more storms. What happened to that?

    Further explain why when the planet was even warmer then today it was mostly a verdant Jungle with swamps and such?
     
  7. westwall
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    westwall USMB Mod Staff Member Gold Supporting Member Supporting Member

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    :lol::lol::lol: So what does this make "tipping point" number 7,201! :lol::lol::lol: You alarmists have had so many tipping points pass us by that you can't walk straight!

    :lol::lol::lol::lol::lol::lol:
     
  8. CrusaderFrank
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    CrusaderFrank Diamond Member

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    Modern Sensitive CO2, it eats glaciers for breakfast and destroys rain forests for lunch.

    What's for dinner?
     
  9. rdean
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    rdean rddean

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    If we're lucky, Republicans.
     
  10. westwall
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    westwall USMB Mod Staff Member Gold Supporting Member Supporting Member

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    But if it wer'nt for republicans you wouldn't get your welfare check!
     

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