The EU ETS is a grandiose experiment that could pave the way for the EU becoming a pioneer in market mechanisms to counter global change. The speed of its implementation has surprised seasoned observers of Brussels decision processes. However, a timid approach to the national allocation of allowances could reduce the credibility of the instrument and prevent learning that will be crucial for later, deep cuts in greenhouse gas emissions. Moreover, it will reduce the private sector acquisition of emission credits from the CDM which is necessary to embark on a global strategy for emissions reduction. A short-term bow to powerful interest groups from sunset industries risks shutting off the way forward for the sunrise industries that will grow on mitigating global climate change.