In order to encourage countries to actively reduce emissions, the COP has prepared a number of tools which countries can utilize flexibly. These tools include collective reductions, swaps (in which countries are allowed to trade their quotas), and the "Clean Development Mechanism." This has already led to a lively international trade in CO2 quotas.
為鼓勵各國積極減量，締約國組織也準備了許多工具與手段，讓各國更靈活採用，比如共同減量、排放交易、清潔發展機制等三種誘因，已使國際二氧化碳的「交易」活絡起來。