Here&#x27;s a related question:  Supposedly
now the CO2 concentration is about
400 parts per million (maybe by weight)
and up from ballpark 200.<p>Okay, how much CO2 is 200 parts per million
in the atmosphere?  Then, how does that 
much CO2 compare with what comes from
human activity?  Or, over a time interval
while CO2 concentration increases by, say,
1 part per million, how much CO2 was
generated during that time interval?<p>Why?<p>(1) The atmosphere is a biggie thing,
and maybe CO2 from human activity is 
tiny in comparison, too small to represent
increasing CO2 concentration by 200 parts
per million.  Need some numbers to know.<p>(2)There are claims that CO2 emitted into
the atmosphere by human activity is tiny
compared with that from volcanoes and 
rotting vegetation.  If so, then we have
to ask where the CO2 for the increased
concentration is coming from?  From
the oceans as they slowly warm from
the cooling of the Little Ice Age?<p>My point about the cooling of the Little
Ice Age was that it was likely not caused
by reductions in CO2 from human activity.
Indeed, as the climate cooled, humans had
one heck of an incentive to burn all the
firewood they could find.  So, the Little
Ice Age seems to be a case where
there was drop in temperature without 
a drop in CO2 from human activity.  If so,
then there have to be some causes of
temperature change other than 
changes in the rate of CO2 emissions from
human activity.  That is, apparently there
would be climate change even without
humans.