>Is there any circumstances where the environment isn't safe?

I thought it was readily available on all BSD-derived Unices.  viz:
haggis 71 uname ; who ; echo i am `who am i` ; ps -wwe -tp1
BSD/OS
salzr            ttyp0   Feb 10 14:58   (camstig)
bowe             ttyp1   Feb  7 08:36   (taco)
i am salzr ttyp0 Feb 10 14:58 (camstig)
  PID  TT  STAT      TIME COMMAND
  276  p1  Is+    0:00.72 TERM=vt100 LINEMODE=real HOME=/usr/home/bowe
LOGNAME=b
owe SHELL=/bin/tcsh USER=bowe
PATH=/bin:/usr/bin:/usr/contrib/bin:/usr/X11/bin -
tcsh (tcsh)
haggis 72
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