ENV100Y5 Lecture : env100 note 56.docx

• School: UTM
• Department: Environment
• Course: ENV100Y5
• Professor: murk

Document Summary

Several steps precede the disposal of hazardous waste: for many years, hazardous waste was discarded without special treatment, public did not know it was harmful to human health. It was assumed that substances would disappear or be diluted in the environment: now cities designate sites or special collection days to gather hhw. Surface impoundments store liquid hazardous waste: shallow depressions are lined with plastic and clay, residue of solid hazardous waste is transported elsewhere, the underlying clay layer can crack and leak, rainstorms cause overflow, contaminating nearby areas. This lecture will help you understand: environmental health hazards and the goals of environmental health, toxins in the environment, risk assessment and risk management, philosophical approaches to risk. Biological and cultural hazards: biological hazards: interactions with organisms, viruses, bacteria, and other pathogens. Silent spring began the public debate over synthetic chemicals: rachel carson (1962, generated significant social change, presented the risks of ddt, 1960s: pesticides mostly untested; sprayed over public areas.