How can we assign value to the environment?

How can we determine the price of environmental benefits and pollution so that these factors come to form part of an economic analysis in an acceptable way?
The question of how we assign value to the environment has really become a topic of current interest, especially in the wake of the Ministry of Finance’s report on environmental policy’s benefits and costs. Recently, we have seen this in the cost-benefit analysis of particle-emissions from heavy vehicles. There are, however, serious methodological problems with how we can determine the monetary value of the environment.
The project will be carried out in 2002 with a consensus conference.