not like the gas carbon dioxide for which only 'crazies'
consider a pollutant. I suppose it could be said astronauts
pollute their environment. They do not need to use the larger
biosphere("to clean the air") which should tell you how easy it
is. In addition to ground transport, air transport is a
consideration. (We can leave sea for another day... a large
place to hide or dump trash for a time) I did some editing and
put in bold a comment about a or the rate-determining step
involving a layer of atmosphere. The rds is a chemical term i
searched for a few days ago and just got around to reading. You
also will note that they do not use the word saturation but
instead speak of a new equilibrium. Table 4 (CONCAWE (1997), EC
(1996)) shows how the emissions of CO, hydrocarbons, NOx and
particulate matter have been reduced in Europe, reflecting the
ability of technology to deliver reductions in emissions. The
data show how the largest reductions in emissions have already
taken place, with projections that further r