There have been suggestions about putting dust or solar absorbing material in orbit in the past (I think they were covered in the 1992 NAS report, for example). The idea actually goes back at least to Hoyle (1957) and was expanded on by Kahle and Deirmendjian (1973) of Rand Corporation. The basic problem, however, is that particles get moved around by the solar wind and it is very hard to keep them in orbit for long.
Mike Refs: Hoyle, F., 1957: The Black Cloud, Harper and Brothers, New York. Kahle, A. B., and D. Deirmendjian, 1973: The black cloud experiment, Rand Corporation report R-1263-ARPA, Santa Monica CA. On 1/14/09 10:34 AM, "David Schnare" <dwschn...@gmail.com> wrote: > Andrew: > > That is but one theory and reflects a weak correlation. It is not proved and > is not subject to scientific testing. Other phenomena seem much more likely > to have caused the cooling in that period. > > David Schnare > > On Tue, Jan 13, 2009 at 10:13 PM, Andrew Lockley <andrew.lock...@gmail.com> > wrote: >> >> I note from the literature that the severe but short cooling period >> which started in 1159BC is now believed to have been caused by comet >> dust. Has the use of similar dust been considered for geoengineering? >> The resulting cooling period lasted for 18 years, which suggests a >> longer time of action than sulfur based aerosols. >> >> A >> >> >> >> >> --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to geoengineering@googlegroups.com To unsubscribe from this group, send email to geoengineering+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en -~----------~----~----~----~------~----~------~--~---
