A critical issue in dealing with climate change is deciding who has a right to emit carbon dioxide (CO
2
),
and under what conditions, when those emissions are limited. The European Union Emissions Trading
Scheme (EU ETS) is the world’s first large experiment with an emission trading system for CO
2
and it is
likely to be copied by others if there is to be a global regime for limiting greenhouse gas emissions. This
paper provides the first in-depth description and analysis of the process by which rights to emit carbon
dioxide were created and distributed in the EU ETS. The main objective of the paper is to distill the lessons
and general principles to be learned from the allocation of allowances in the EU ETS, i.e. in the world’s
first experience with allocating carbon allowances to sub-national entities. We discuss the lessons and
unifying observations that emerge from this experience and provide some insights on what seem to be more
general principles informing the allocation process and on what are the global implications of the EU ETS