This book tells how the Montreal Protocol, the most successful global environmental agreement so far, stimulated the development and worldwide transfer of technologies to protect the ozone layer. Technology transfer is the crux of the 230 international environmental treaties and is essential to fighting climate change. While debate rages about obstacles to technology transfer, until now there has been no comprehensive assessment of what actually works to remove the obstacles. The authors, leaders in the field, assess over 1000 technology transfer projects funded under the Montreal Protocol’s Multilateral Fund and the Global Environment Facility, and identify lessons that can be applied to technology transfer for climate change.