The conclusion is that, it will cause a great economicwaste to use the environment-hagardous transitional substitutes.
指出环境不友好的过渡性替代物的应用会走技术改造的弯路, 造成巨大的经济损失。
2
Pay Drechsel, an environmental scientist, argues that the social and economic benefits of using untreated human waste to grow food outweigh the health risks.