Diplomats say European leaders have agreed on how they will carry out an ambitious plan to fight global warming.

The plan lays out how the 27 member countries will cut carbon emissions by 20 percent by 2020 and is meant to set an example for world efforts to tackle climate change.

The plan includes various burden-sharing measures meant to ensure that the hefty cost of curbing pollution will not impede economic growth. The cost of the plan had caused uproar among many poor eastern European countries, especially as the continent grapples with economic downturn.

The diplomats announced the deal Friday at an EU leaders summit. They spoke on condition of anonymity because they were not authorized to announce the conclusions publicly.