The bloc also agreed to boost the use of renewable energy to 27% in the total energy mix
EU leaders have reached a landmark deal to cut greenhouse emissions by 40% by 2030, compared with 1990 levels.
The binding decision came after heated discussions at a summit in Brussels, as some members had argued that their varied interests should be protected.
Correspondents say it could make the EU a leader again in climate policy.
The bloc also agreed to boost the use of renewable energy to 27% in the total energy mix and increase energy efficiency to at least 27%.
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