Carbon dioxide anthropogenic contribution

The extent to which man-made carbon dioxide emissions contribute to global warming is still an issue of considerable debate. Analysis indicates that while the contribution to the total amount of this gas in the atmosphere from anthropogenic sources amounts to 3 to 4 percent, the problem is that carbon dioxide remains in... 

Arrhenius recognized that carbon dioxide released from anthropogenic sources, primarily the burning of coal, would contribute to... 

It can be seen that there are natural inputs of pyrolytic PAHs to the environment as there are for atmospheric carbon dioxide. However, unlike C02, anthropogenic PAH contributions in contemporary sediments exceed natural inputs. This increase in environmental burden may, therefore, be significant in its effects on organisms. 

The radiatively active trace gases, which contribute most to atmospheric absorption, and hence play a key role in the energy budget of the middle atmosphere, are carbon dioxide, ozone, and water vapor. Other gases, whose sources are partly related to anthropogenic activity (such as CH4, N2O, and chlorofluorocarbons) also contribute to the radiation budget. 

Estimates of annual amounts of emissions released into the earth s atmosphere are remarkably different from each other, depending on the choice of balance models [5-24]. For the anthropogenic sources, the following substances may be listed in decreasing order of importance carbon dioxide, carbon monoxide, sulphur oxides, hydrocarbons, nitrogen oxides and liquid and solid particles. A summary of relative contributions of these substances to total emissions of main types of anthropogenic sources is given in Table 5.8. 

Carbon dioxide is considered as a main greenhouse gas. Its contribution to global warming can be pointed up by correlations between the evolution of CO2 in atmosphere and the average earth temperature [1]. Since the eighteenth century the concentration of CO2 has approximately risen from 280-380 ppm when simultaneously temperature has increased by 0.6 K. Anthropogenic sources of carbon dioxide represents currently about 25 Gt per year. If we consider constant industrial development and population growth in the world, the emissions of carbon dioxide will... 

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