The first objection one hears about the current climate change is that such   
   cycles have always existed.   
      
   True enough, but the question at hand is if the current cycle has been   
   influenced by human activity.  The current uptick of the natural cycle and   
   human intense agriculture are roughly at the same time.   
      
   So the idea that this cycle is different can be tested.   
      
   'Climate change: How do we know?'   
      
   https://climate.nasa.gov/evidence/   
      
   Our poster suggested it had to do with the formation of the Isthmus of   
   panama a few million years ago on recent climate cycles.   
      
   Ice captures markers of climate change as it happens so we can test if the   
   current cycle is different .   
      
   The article says there has been in the last 650k years 7 such cycles, the   
   last starting to increase some 6000k years ago along with human activity   
   in the markers of reasons for faster change.   
      
   So our poster's notion is refuted that it alone is responsible for the   
   current cycle.  and its evidence for the amount of warming.   
      
   Read the above NaSA  article to see what we know and why.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)