other substitutes are available in many applications and that some may be more harmful than solvents. In order to limit the possibility of regulation leading to increased harmful exposures, regulation must be broad enough in scope to deal with existing substitutes and flexible enough to anticipate the introduction and use of as-yet-unknown substitutes. An environmental bond, similar to the form of depositrefund proposed above for solvent still bottoms, is one regulatory tool that could be used to discourage the introduction of harmful substitutes while limiting information requirements for regulators.29
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