From: nobody@nowhere.com   
      
   [snippage]   
   >> Indeed. A careful look at the Keeling curves shows annual oscillations of   
   >> 5   
   >> PPM. In his movie, Al Gore dismissed this as only the biosphere   
   >> breathing.   
   >> The oscillations exceed the annual increase in CO2. The oscillations   
   >> prove   
   >> that atmospheric CO2 is recycled at a rate, from which we could calculate   
   >> rate and half life. I once calculated 20 years but you should check my   
   >> work   
   >> and derive your own science.   
      
   A more recent estimate is that the residence time of of CO2 is four years.   
   One must consider all carbon cycles, biological, geochemical, anthropogenic,   
   rediochemical, etc. If you can think of more carbon cycles, we can get an   
   even lower estimate.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)