1. School of Social Ecology, University of California, Irvine, California 92697,
United States
2. Key Laboratory
of Solid Waste
Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59
Qinglong Road, Mianyang, 621010, China
3. Program in Public Health, Department
of Population Health and Disease Prevention; and School of Social
Ecology, University of California, Irvine,
California 92697-3957, United States