Installations covered by the European Emission Trading Scheme (EU ETS) can use credits from the Clean Development Mechanism (CDM) to cover a share of their emissions. The CDM credits are generated by low-carbon projects in developing countries that require the CDM support to become financially...

In the European Emission Trading scheme the supply of allowances exceeds emissions - cumulating, according to our estimates, in a surplus of 2.7 billion tonnes by 2013/2014. We find that initially the surplus was acquired by power companies so as to hedge future carbon costs. As the surplus...