A Green Paper is a consultation document issued by the government which contains policy proposals for debate and discussion before a final decision is taken on the best policy option.
A Green Paper will often contain several alternative policy options.
Following this consultation the government will normally publish firmer recommendations in a White Paper.
Green Papers and White Papers are both types of command paper and may be the subject of statements or debates in the House of Commons.
Unsurprisingly, it is printed on pale green paper.