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One such extreme option includes shooting pollution particles into the upper atmosphere to reflect the sun's rays. Holdren said such an experimental measure would only be used as a last resort.
"It's got to be looked at," he said. "We don't have the luxury of taking any approach off the table."
Originally posted by jibeho
Second, these morons have to figure out if the climate is warming or cooling. The overwhelming majority of the scientific community seem to think we will be on a cooling trend.
For years, scientists have proposed supercharging algae growth by dumping tons of iron into the ocean.
Shrimplike animals devoured 159 square miles (300 square kilometers) of artificially stimulated algae meant to fight global warming—casting serious doubt on ocean fertilization as a climate-control tool.
experts have warned of unintended consequences, such as unpredictable reactions in the ecosystem.
And that's just what happened during a recent, large-scale iron dump in the South Atlantic, the Alfred Wegener Institute in Germany announced this week.
Holdren noted that shooting particles into the air — making an artificial volcano as one Nobel laureate has suggested — could have grave side effects and would not completely solve all the problems from soaring greenhouse gas emissions.
Atmospheric aerosols play an important role in the global climate system. Aerosol particles influence the global radiation budget directly, by scattering and absorption ( ° Angstr¨om, 1962; McCormic and Ludwig, 1967), as well as indirectly, by the modification of cloud properties (Twomey, 1974; Graßl, 1975; Twomey, 1977; Albrecht, 1989; Hansen et al., 1997; Lohmann, 2002), with feedbacks to the hydrological cycle (Lohmann and Feichter, 1997; Liepert et al., 2004). Furthermore, heterogeneous reactions on the aerosol surface and in liquid aerosol particles interact with the chemistry of the atmosphere (Ravishankara, 1997; Andreae and Crutzen, 1997; Crutzen, 1996; Dentener and Crutzen, 1993). Pollutants, such as DDT, condense on aerosol particles so that their transport and deposition are largely determined by the aerosol pathways (van Pul et al., 1998; Unsworth et al., 1999). Moreover, the deposition of aerosol in the ocean plays an important role in the biogeochemical cycle of the oceans (Vink and Measures, 2001; Johnson et al., 1997). Nevertheless, the quantitative comprehension of the role of aerosols is still insufficient (e.g. Penner et al., 2001; Ramanathan et al., 2001; Heintzenberg et al., 2003). To increase the understanding of this complex system, the ECHAM5 General Circulation Model (GCM) (Roeckner et al., 2003) has been extended by a complex aerosol model allowing long-term, i.e. depending on the model resolution centennial to millennial scale, transient climate simulations. A major objective is to quantify the aerosol radiative effects and their impacts on the global climate system for present day and future conditions.