Supplementarity
The Kyoto Protocol states that Emissions Trading and Joint Implementation activities are to be supplemental to domestic actions (e.g., energy taxes, fuel efficiency standards, etc.) taken by developed countries to reduce their greenhouse gas emissions. Under some proposed definitions of supplementarity, e.g., a concrete ceiling on level of use, developed countries could be restricted in their use of the Kyoto Mechanisms to achieve their reduction targets. This is a subject for further negotiation and clarification by the Parties.
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