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… years. The effectiveness of airborne transport of POP s is determined by the interplay between: transport (i.e., wind … of POP s in the environment; and (2) what is the relative contribution from secondary sources (e.g., soils and oceans) … Change 2007: Impacts, adaptation and vulnerability. Contribution of Working Group II to the Fourth Assessment …

… optical depth (AOD) exceeds 0.3 and the percentage of contribution by absorbing aerosols exceeds 10 per cent … The net effect of ABCs on the global mean climate is determined by the sum of their effects on the atmosphere (a … The field involves assessing, at the molecular level the contribution of environmental risk factors, with the …