Your off by a few decimal places.
The Earth's atmosphere is a thin layer of gases that surrounds the Earth. Its composed of 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and trace amounts of other gases.
From: http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Atmosphere.shtml
But your point is even more apparent. 0.03% = 0.0003 or 3 parts out of 10,000..
And it's probably changed from 0.000297 to 0.0003 because of man.
Oops...
But then whats a few decimal places to your average climate scientist.
Thanks for pointing that out.
"But your point is even more apparent. 0.03% = 0.0003 or 3 parts out of 10,000..
And it's probably changed from 0.000297 to 0.0003 because of man."
So if man is reponsible for even as much as 10% of the CO2 levels and the Kyoto Treaty would have us cut back 10% on manmade emissions that puts the level decreased by 0.000003 of the THIRD strongest greenhouse gas. Wow, that really helps, doesn't it?
There is 350 parts per million CO2 content in current atmosphere.
See this chart on the concentration of various "greenhouse" gases:
http://cdiac.esd.ornl.gov/pns/current_ghg.html
On the changes to CO2:
http://www.john-daly.com/bull120.htm
"As I have pointed out frequently (Gray 1998) background carbon dioxide as measured at remote sites has been increasing in the atmosphere at an almost linear rate of about 1.4ppmv per year ever since 1972. The rate seems to be unaffected by the large increase in emissions form combustion of fossil fuels over the period (4.4Gt in 1972 to 6.4Gt in 1995, an increase of 45%)."
Before the industrial age, ie 1750, there was 280 ppm CO2, now its somewhat higher... to get to the dire consequences of 'global warming' you have to assume much larger increases in CO2 concentrations, on the order of 500 ppm or higher.
This paper shows the increased concentrations in CO2 as measured in Muana Loa in hawaii:
http://www-das.uwyo.edu/~geerts/cwx/notes/chap01/co2_change.html