Although the role of clouds is not well understood (IPCC, 2001), it appears that the upper tropospheric clouds warm, while the lower clouds, such as those potentially generated by the above CRF seeded processes, cool the climate. In such a scenario, the impact of pollution, if indeed significant, could even potentially result in global cooling (Carslaw et al., 2002) instead of global warming, similar to the IPCC chain of reasoning that is invoked as an explanation for the 1940-1976 cooling trend (Fig. 14d). In addition, we would have to deal not with a global issue of atmospheric CO2, but with large regional phenomena, because it is these that control the dispersion of aerosols, sulphur and nitrogen compounds. We are not yet in a situation where quantitative projections of this impact on climate can be provided (Schwartz, 2004). Indeed, we do not even know if it is at all globally significant, equal to any potential warming generated by CO2, or much larger. In any case, the strategy that emphasizes reduction of human emissions is sound for both the celestial and the CO2 alternative. Nevertheless, this strategy can be pursued in two ways. It can be based on global reduction of CO2, because this would result also in collateral reduction of particulates, sulphur and nitrogen compounds. These are not only potential climate drivers, but also pollutants and their reduction will improve our air quality, regardless of the climate impact of otherwise environmentally benign CO2. At current atmospheric levels, CO2 is in fact an essential commodity for propagation of life on this planet. Any remedial measures based on the global CO2 scenario are also costly. For the celestial alternative, the remedial measures may focus directly on the "collateral" pollutants, which could potentially result in a substantial reduction of the economic cost to mankind. However, the decision as to the best strategy is not a simple prerogative of science, but must also take into account political, economic and social considerations.