Study on Evaluating the Sustainability of Innovative Products

Table 6

5 × 5 matrix assessment for cloud rail and metro.

Life cycle	Environmental impacts
	Materials	Energy use	Solid residues	Liquid residues	Gaseous residues
Preproduction	4, 1	3, 2	4, 2	4, 2	4, 2
Production	4, 2	3, 0	3, 0	4, 1	3, 2
Transportation	4, 1	3, 1	3, 1	4, 1	3, 1
Usage	4, 1	4, 2	4, 1	4, 2	4, 1
Disposal	4, 2	4, 2	3, 1	4, 2	4, 1