Day 011 - 12 Jul 94 - Page 18

     
     1        A.  Yes.
 
     2   Q.   You were in the middle, I think, of telling us before his
              Lordship's machine fizzled out what its function is.
     3        A.  Its function was to advise the United Kingdom
              Government of the potential hazards posed by chemicals
     4        which might lead to destruction of the ozone layer.  The
              group, in fact, comprised -- some people were
     5        meteorologists and people who had been involved in
              atmospheric chemistry for quite a long time; many of whom
     6        had previously been involved with a review group set up by
              the World Meteorological Organisation in Nassau, which had
     7        actually reported in 1986.
 
     8   Q.   You should have behind you on the bottom shelf of the grey
              files, nearest the door, there are some orange ones.  You
     9        will need volume 1.  If you pass the first divider right
              at the beginning of the file?
    10        A.  Yes.
 
    Q.   Can I ask you this by way of preliminary:  Are there
              estimates for the lifetimes of CFCs and HCFCs in the
    12        atmosphere, Professor Duxbury?
              A.  There are.
    13
         Q.   What is the estimated lifetime of CFC-12, can you
    14        remember?
              A.  It is of the order of a century.
    15
         Q.   Yes.  We can see an exact estimate; what about HCFC-22?
    16        A.  This is between 10 and 20 years.  It depends on how
              you do the ----
    17
         MR. MORRIS:  I am sorry, I have missed the page we were
    18        referring to.
 
    19   MR. JUSTICE BELL:  This is just introduction.
              A.  If you actually look on page 8 of the reference to
    20        which my attention has been drawn, half way down you will
              see that the estimate for CFC-12 is 111 years.  It is
         below the figure 3.2.  There is a paragraph down there.
              It gives an estimate of 65 years for CFC-11 and 111 years
    22        for CFC-12.
 
    23   MR. MORRIS:  I am completely lost.
              A.  If you look at page 8 of the report, which is entitled
    24        Source Gases 3, there is a figure 3.2, and about an inch
              below that ----
    25
         MR. MORRIS:  Yes, I have it.  So that is the time it remains 
    26        active? 
  
    27   MR. JUSTICE BELL:  Do not ask a question.  If you are uncertain
               -- otherwise we will get very confused -- if you are
    28        uncertain at the end of Professor Duxbury's
              evidence-in-chief, then you ask him questions so you are
    29        clear what he means in cross-examination.
 
    30   MR. RAMPTON:  That gives 111 years for CFC-12; it does not give
              a figure for HCFC-22, does it?