  A general no-go theorem dampens hope that the cosmological constant problem
can be solved by a local symmetry mechanism. The possibility is considered here
that this no-go theorem can be avoided by a pseudo-symmetry. A simple
macroscopic effective field theory is constructed which admits an enhanced
pseudo-symmetry in the absence of a cosmological term. It is pointed out that
this pseudo-symmetry is an exact classical invariance of superstrings. The
conjecture that this pseudo-symmetry survives in the quantum theory has several
interesting consequences.
