leaf environments vs eval environments?

[Lars J. Aas]

I didn't find much docs on environments (programming with them from C),
and I was wondering which type to use.
The leaf environment seems most attractive, because it can be created
with no extra fuzz (no arguments to scm_make_leaf_environment()).

BTW, the environments system is initialized, right, so I don't need to 
call scm_init_environments()?

  Lars J