Richard Benedick, an architect and chief US negotiator for the Montreal treaty, expands upon the first edition of his book. He describes subsequent negotiations to deal with unexpected scientific discoveries and amendments adding new chemicals and accelerating the phaseout schedules. Implementing the revised treaty has forced the protocol's signatories including North-South financial and technology transfer issues, black markets for banned CFC's, revisionism, and industry's willingness and ability to develop new technologies and innovative substitutes. In his final chapter Benedick offers a new analysis applying the lessons of the ozone experiments to ongoing climate change negotiations.