Tractors block a main road in central Brussels during a protest by European milk producers November 27, 2012. Thousands of dairy farmers from all over Europe took part in the demonstration to urge politicians to take efficient legislative measures for the milk market and to listen to farmers' demands for cost-covering prices and fair remuneration, according to the organisers. REUTERS/Francois Lenoir (BELGIUM - Tags: AGRICULTURE FOOD BUSINESS CIVIL UNREST TPX IMAGES OF THE DAY)