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How much atmospheric co2 is from human activity
1. How much
atmospheric
CO2 is from
human activity?
If a football stadium
represented a
sample of our
atmosphere, how
many seats would
be human caused
CO2?
By: Ryan Scott Welch
4. Nitrogen is
78% of the
atmosphere,
Oxygen is
21%, Argon is
.9% giving
you a total of
99.9% of the
atmosphere
Nitrogen Oxygen Argon Trace gassses
5. So, where is
the CO2?
CO2 is a
trace gas
that is only
0.04% of the
atmosphere
which in this
sample = 40
seats.
Nitrogen Oxygen Argon Trace gassses
6. But of the 40
seats, or parts
per 100,000 of
CO2 in the
atmosphere, 25
were already in
the atmosphere
before humans
relied on
hydrocarbon
fuels (coal, gas
and oil) leaving
15 seats.
40 Seat Section
7. And since
humans only
contribute 3% of
all CO2 emitted
into the
atmosphere
each year (97%
is from nature),
the human
contribution is
3% of the 15
remaining seats
in our sample
40 Seat Section
8. 3% of 15 is 0.45
So in our stadium
sample of
100,000 seats the
human
contribution of
CO2 is less than
half of one seat.
Non-Human CO2 Human CO2
40 Seat Section
9. That is less than one half of one seat from
100,000 seats in a Dallas Stadium sized sample
of our atmosphere is human caused CO2.
One single seat
Non-human CO2
Human CO2
10. Less than half of one single seat
is a human caused CO2
molecule. Did you know that?
11. Current atmospheric measurement of CO2
from the Mauna Loa Observatory.
Source data: ftp://ftp.cmdl.noaa.gov/ccg/co2/trends/co2_mm_mlo.txt
Reference Page
12. Climatic Change
1983, Volume 5, Issue 4, pp 315-320
The pre-industrial carbon dioxide level
T. M. L. Wigley
Recent indirect data and direct
measurements from ice cores point towards a
‘pre-industrial’ CO2 level of around 260–270
ppmv, considerably below the commonly
assumed value of 290 ppmv. Early
measurements from the southern hemisphere
tend to favor the lower value.
Note: I use the lowest number of 250 ppmv.
Reference Page
13. Human contribution to CO2
http://www.drroyspencer.com/2009/01/in
creasing-atmospheric-co2-
manmade%E2%80%A6or-natural/
http://www.geocraft.com/WVFossils/gree
nhouse_data.html
http://stevengoddard.wordpress.com/201
1/02/08/evil-oceans-produce-16-times-as-
much-co2-as-humans/
Reference Page
