The EU's statistics agency Eurostat found that while emissions were cut across the 28-member bloc by an average of 2.5 percent in 2013, they actually went up in six countries, including Germany.
Denmark registered a 6.8 percent increase in CO2 emissions. In Estonia it was up by 4.4 percent, followed by Portugal (up by 3.6 percent), France (by 0.6 percent) and Poland (by 0.3 percent).
The greatest cuts in CO2, which accounts for 80 percent of the greenhouse gas emissions causing global warming, came from Cyprus, where emissions went down by 14.7 percent, followed by Romania (down by 14.6 percent) and Spain (by 12.6 percent).
The EU produced 3.35 billion tonnes of CO2 in 2013, down from the previous year's total of 3.43 billion tonnes.
Germany, Britain, France, Italy, Poland, Spain and the Netherlands account for 77 percent of the EU's CO2 emissions.
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