As part of environmental policy, emissions trading aims to reduce pollutant emissions at the lowest possible economic cost.
The total number of emission allowances available within the European Union will decrease by 1.74% per year, eventually reaching 21% below 2005 levels in 2020.
The shortage of this supply may mean an increase in prices in the long run.
Currently, emissions from power and heat generators and civil aviation are traded in Europe. From 2013, petrochemical, ammonia and aluminium plants will be added.
The trading volume of emission rights in the EU now amounts to USD 50 billion (EUR 37 billion).
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The statistics show the ten largest CO²-emitting countries by share of global CO² emissions in 2012. China was the world's largest carbon dioxide emitter in 2012, with a share of around 21 percent of global carbon dioxide emissions.