From the BBC:

EU environment ministers have agreed in principle to cut greenhouse emissions by 20% from 1990 levels by 2020.

The ministers, meeting in Brussels, also agreed to seek a 30% cut worldwide if matched by other developed nations.

The proposals, outlined by the European Commission in January, are seen as a key measure to curb climate change.

The EU must still decide how to make cuts, allowing for a possible compromise with member states opposed to mandatory targets.

Hungary and Poland, who joined the EU in 2004, are said to have opposed the cuts.

Finland has also reportedly voiced opposition to the Commission's targets.