One of the basic theoretical schools ot the present-day economy is the neo-classic economy. The scope ot studies of this economy has been confined to the problems ot allocation of the limited resources in economy. In spite of being far from perfect this trend has many practical anti theoretical achievements in the field of analysis of the ecological and economic problems. The four most important approaches of the neo-classicists to the ecological problems (e.g. the theory of the economic development ecologically conditioned and the cost-benefit analisis) are discussed in detail.