Dan Marotta wrote on 7/20/2015 9:59 AM:
In 1804 the population of the earth was 1 billion people.� It took 123
years to add another billion, then 33 years, then 14, then 12 to get the
population up to 6 billion by 1999 (source
https://www.learner.org/courses/envsci/unit/text.php?unit=5&secNum=4).� Now
the human population is roughty 10.8 billion people (source
http://populationpyramid.net/world/2015/)!

I don't suppose all those people blowing CO2 into the atmosphere has
anything to do with this?

You suppose correctly: The added CO2 clearly comes from fossil fuel
sources, as determined by isotopic analysis of the CO2 in the
atmosphere. There is no controversy about where the increased CO2 is
coming from:

http://www.skepticalscience.com/its-...termediate.htm

There is another way to know this: all the carbon in our bodies comes
from plants; when we exhale, we are simply returning CO2 to the
atmosphere, where the plants we ate (or the animals we ate) got it in
the first place. This article speaks directly to that point:

http://www.skepticalscience.com/brea...on-dioxide.htm

Climate is a fascinating subject, in good part because a lot of it is
non-intuitive until you study it for a while.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)
- "A Guide to Self-Launching Sailplane Operation"

https://sites.google.com/site/motorg...ad-the-guide-1
- "Transponders in Sailplanes - Dec 2014a" also ADS-B, PCAS, Flarm

http://soaringsafety.org/prevention/...anes-2014A.pdf