Wealthy northern European countries including Britain bear the brunt of the EU's plans to meet the commitment it made at the Paris climate summit in December to cut emissions by 40 percent over 1990 levels.
Despite Britain's shock referendum vote last month for Brexit, the European Commission included it on its list of proposed binding emissions targets for all 28 EU countries.
"These targets are realistic, fair and flexible," EU Climate Commissioner Miguel Arias Canete told a press conference, adding that the targets would become legally binding if and when approved by member states.
Britain and France are asked to cut emissions by 37 percent while Netherlands and Austria should cut by 36 percent.
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"Let's be very clear: from a legal point of view the outcome of the referendum has not changed anything," Spain's Canete said when asked whether the proposed targets would have to be readjusted following Britain's exit.
"The UK (United Kingdom) remains a member state with all the rights and obligations for member states and EU law continues to apply in full to the UK," he said.
In contrast, poorer eastern and southern EU countries are asked to contribute far less to the targets, despite the fact that they often rely more heavily on dirtier fossil fuels.
Bulgaria, the poorest state in the bloc, was given an emissions reductions target of zero percent, while Romania, Latvia, Croatia, Poland, Hungary and Lithuania are all set below 10 percent.
Poland in particular gets off lightly given its reliance on coal-fired power stations.
The system allows for flexibility. Member states can reduce emissions jointly across a range of sectors and over time.