A Modified Combination Rule for Numbers Theory

Table 6

Overall environmental impacts and ranking of each project.

Method	Ranking
ER approach
Risk-neutral	Project 2 project 4 project 3 project 1
Risk-taking	Project 2 project 3 project 4 project 1
Risk-average	Project 4 project 2 project 3 project 1
method
Decision-optimistic	Project 3 project 2 project 4 project 1
Decision-pessimistic	Project 4 project 2 project 3 project 1