
Global and Domestic Carbon Dioxide Emissions
& their Effect on Climate Change
Other Greenhouse Gases and Life Span
Carbon dioxide is not the only participant in global change, in fact it is
a very weak absorber of infrared radiation. The most important greenhouse
gas is water vapor, as it absorbs over a long range of infrared wavelengths
[5], and the large predicted changes in temperature will be a result of positive
feedbacks to shift more water vapor into the atmosphere. Contributions from
other species are summarized below[4] [6].
Also listed below is the typical life span of the atmospheric
gases. Unfortunately, atmospheric CO2 values do not hover around some fixed
equilibrium position. The biosphere will not change to return to a past equilibrium
value (though we witness an inertia to change by uptake by the oceans), rather
those species that can be consumed in atmospheric chemical reaction like
CH4 will, whereas the CO2 will stay at its elevated concentration for perhaps
millions of years.
Gaseous Species Responsible for Greenhouse Effect
|
Species
|
Percent Contribution
|
Life Span
|
CO2
|
55%
|
500 years
|
CH4
|
15%
|
7-10 years
|
N2O
|
6%
|
140-190 years
|
|