Yeah, enough is enough and 6 billion sounds like enough to me.  Its 
 not like all those millions in Calcutta and Bombay are just having a 
 fine time jammed together on the sidewalks (call it home) trying to 
 avoid starvation, heat stroke and cobras.  
 
 Anyway, by my math you'd need 600,000 square miles to pack in 6 
 billion people at 10,000 per square mile (denser than Washington 
 D.C.).  Thats Texas, New Mexico, Arizona and California at least. 
 And 6 billion is probably old news by now, call it 7. 
 
 -----------------------------------------
 
 --- In 
DSN_KLR650@yahoogroups.com, "Arden Kysely"  
 wrote:
 
 > 
 > Sure, pack 'em in! But don't forget that they need food and homes 
  
and 
 
 > produce waste. There may be resources for 6 billion on the planet, 
  
but 
 
 > what about 12, or 24, or 48? Where does it stop? Where do the 
 > resources come from? Can you call it living if you bump into 
  
someone 
 
 > or step in their waste every time you turn around? We go to places 
 > like Death Valley just because they are empty and we enjoy the 
  
feeling 
 
 > of space. If every landmass was chock-full of humans we wouldn't 
  
have 
 
 > much place to ride, or otherwise recreate. Why not hold the 
  
population 
 
 > steady and keep the Earth a decent place to live? On the other 
  
hand, 
 
 > putting them all in Texas sounds pretty good, too. 8~)
 > 
 >