European leaders have agreed to stick to an ambitious plan to fight global warming through emissions cuts and renewable energy, and on ways to share the hefty costs of setting a global example.

The plan includes concessions to heavy industry and countries in Eastern Europe that are worried that the cost of curbing pollution would impede economic growth, especially as the continent grapples with economic downturn.

The plan, agreed at an EU summit in the Belgian capital Brussels on Friday, lays out how the 27 member countries will cut carbon emissions by 20 percent by 2020.

European diplomats had haggled through the night on complex plans to fulfill promises made last year to meet so-called 20-20-20 targets, which include reducing greenhouse emissions by 20 percent and ensuring that 20 percent of energy comes from wind, sun and other renewable sources by 2020.

Speaking afterwards, Polish Prime Minister Donald Tusk said he was "satisfied" with the proposals vis a vis Poland.

"For Poland, it was very important to achieve more solidarity in this climate package and I can say that we achieved this target. We tried to explain to our partners that we can be responsible for climate protection but not without solidarity between rich Europe and poor Europe. And yes, I am satisfied today, this is a good result for us."

But environmental groups were less pleased with what they saw as a patchwork of compromises making up the plan.