Emissions grew by 0.5 per cent compared with 2014, mainly due to increases from transportation and a colder winter, the European Environment Agency said.
Greenhouse gases are a major contributor to man-made climate change and most countries around the world have pledged to reduce emissions under the 2015 Paris Agreement.
The report was released as the EU is trying to emphasize its commitment to combating global warming, with senior European officials appealing to President Donald Trump not to quit the Paris accord. Trump was scheduled to announce his decision today afternoon in Washington.
It noted that improvements in fuel efficiency failed to offset the growth in traffic.
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"Road transport emissions about 20 per cent of total EU greenhouse gas emissions increased for the second year in a row in 2015, by 1.6 per cent," the agency said.
It noted, however, that the EU has achieved a long-term reduction in greenhouse gas emissions from 1990 to 2015 of 22.1 per cent despite economic growth of 50 per cent.
Milder winters have also contributed to a decline in heating fuel use, the agency said.