Last November I wrote about the important research of Nir Shaviv and his co-researchers at the Hebrew University in Jerusalem concerning global warming [see http://urbaneconomics.blogspot.com/2006/11/global-warming-alternative-viewpoint.html]. According to Shaviv's model, recently (partly) tested at CERN (see http://www.sciencebits.com/CO2orSolar), the major source of influence on the earth's temperature is solar activity that causes ionization and cloud formation.
Added evidence was provided by the Danish National Space Center (DNSC) Sky experiment that was published in the Proceedings of the Royal Society. Shaviv reported as follows [http://www.sciencebits.com/SkyResults]:This is the Royal Society's press release on the publication of Svensmark et al.: “Using a box of air in a Copenhagen lab, physicists trace the growth of clusters of molecules of the kind that build cloud condensation nuclei. These are specks of sulphuric acid on which cloud droplets form. High-energy particles driven through the laboratory ceiling by exploded stars far away in the Galaxy - the cosmic rays - liberate electrons in the air, which help the molecular clusters to form much faster than atmospheric scientists have predicted. That may explain the link proposed by members of the Danish team, between cosmic rays, cloudiness and climate change.”
Now the Shaviv team proposes a theoretical model that provides an insight concerning a possible technology that can reduce global warming. If solar activity does not provide the means for cloud formation over the Pacific Ocean, a set of giant lasers firing horizontally high in space can create the required effect.
I am far from capable of judging these ideas. But in the absence of contrary evidence, it makes me skeptical about size of the anthropogenic influence on global warming and hopeful that technology will provide the answer. I would like to hear some cogent discussion of the Shaviv hypotheses.