School parties at Christmas are not only a time of great celebration but also of great waste, a survey has found. The environmental group Green Sense investigated 66 schools to find what they consumed at parties last year. On average each class had more than two boxes of leftover food after the party had ended, which amounted to more than 50 boxes at each school. 'If we calculate on the basis of these findings, there would have been around 56,000 boxes of food dumped over last Christmas in the city's 1,100 kindergartens, primary and secondary schools,' a Green Sense spokeswoman said. 'This would be enough to cater for 50,000 people at a dinner.' In addition, each school used an average 2,211 pieces of disposable plastic forks, cups and plates, and only one quarter of them encouraged pupils to bring utensils from their homes. The green group called for all schools to cut down on waste during festivities this year. 'Teachers should discuss with students on the proper amount of food prepared for the party in advance. It is also a good habit to reuse festival decorations and to collect drinks packages that can be recycled,' the spokeswoman said. The survey also revealed that the three most unwelcome party food were fried noodles and rice, sandwiches, and homemade cakes. Pupils said their favourite food was fish balls.