This paper examines in detail the way in which additionality is determined in the Chinese wind power market and draws out broader implications for the design of effective global carbon offset policy. While this paper focuses on the specific challenges of additionality assessment in China, which has by far the largest number of CDM projects, it is important to note that the challenges of CDM project validation in China are relevant in most of the developing world. Suggest a resolution to the wind power controversy, highlight underlying structural flaws in how additionality is applied in China that created these problems, and chart a CDM reform path that can enable more efficient project approval and strengthen the credibility of global carbon markets .