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The EU emissions trading scheme is the largest emissions control scheme in the world, capping almost half of European CO2 emissions. As the scheme emerges from its pilot phase, this special issue of Climate Policy journal analyses the lessons learned from the last two years and their implications for phase II. The volume presents some of the key analyses that helped inform the European Commission's decisions on national allocation plans, with research ranging from detailed country-by-country comparisons to more generic analysis that puts forward the case for harmonization. Challenging calls to seperate electricity from other sectors, a macroeconomic study suggests that the biggest efficiency gains come from inter-sectoral trading, even more than international trading. Empirical papers, which look at the expected scarcity of allowances in the market and merge models for the power and non-power sectors to project emissions and contrast these to the aggregate allocation volume, are complemented by two numerical simulations of trade and distributional effects, estimating the efficiency gains of the EU ETS in phase I and assessing allocation and distribution effects in the RGGI context.

How well do our assumptions about the global challenges of energy, environment and economic development fit the facts? Energy prices have varied hugely between countries and over time, yet the share of national income spent on energy has remained surprisingly constant. The foundational theories of economic growth account for only about half the growth observed in practice. Despite escalating warnings for more than two decades about the planetary risks of rising greenhouse gas emissions, most governments have seemed powerless to change course. Planetary Economics shows the surprising links between these seemingly unconnected facts. It argues that tackling the energy and environmental problems of the 21st Century requires three different domains of decision-making to be recognised and connected. Each domain involves different theoretical foundations, draws on different areas of evidence, and implies different policies. The book shows that the transformation of energy systems involves all three domains - and each is equally important. From them flow three pillars of policy – three quite distinct kinds of actions that need to be taken, which rest on fundamentally different principles. Any pillar on its own will fail. Only by understanding all three, and fitting them together, do we have any hope of changing course. And if we do, the oft-assumed conflict between economy and the environment dissolves – with potential for benefits to both. Planetary Economics charts how.