EU leaders say they will cut carbon dioxide levels by 20% from 1990 levels but methods have yet to be agreed
European Union leaders have agreed to meet 20% of their energy requirements from renewable sources by 2020.
Thel 27 EU states have been asked to contribute their ideas on how this might be achieved. One method muted is the banning of filament lightbulbs by 2010.
In another key measure, agreed last week, EU leaders said they would cut carbon dioxide emissions by 20% from 1990 levels by 2020.
European Commission President Jose Manuel Barroso said the agreement was historic: "We can say to the rest of the world, Europe is taking the lead, you should join us in fighting climate change."
UK Prime Minister Tony Blair said: "These are a set of groundbreaking, bold, ambitious targets for the European Union. It gives Europe a clear leadership position on this crucial issue facing the world."