The deal makes three main promises to be obtained by over the next 13 years:
Eastern European nations, which preferred to stay with coal and oil, went along with the deal after western nations conceded that individual targets would be set for each EU member within the overall goal.
"There's a deal on the whole package," one diplomat said. He explained that while the 27 leaders had set binding Europe-wide objectives, "setting national targets will be done with the consent of the member states," MSNBC reports.
The way was cleared for a deal when Jacques Chirac, the French president, on Thursday night backed plans for a legally binding target for boosting renewable energy in the EU, provided France's nuclear sector was taken into account when setting national targets for green power.