HLSC 1F90 Lecture Notes - Lecture 23: Healthy Planet, Falling Slowly, Water Pollution
13 Apr 2016
School
Department
Course
Professor
Document Summary
Human health is fundamentally related to the health of the planet. Humans can become ill, or die from: Coming into contact with polluted water, soil, objects. Reliance on fossil fuel for powering machinery and vehicles, heating houses, cooking food, etc. Poor waste management practices (couples with excessive packaging/ poor sanitation) October 2011: global population reached 7 billion: 1 2 billion (123 years, 6 7 billion (12 years, 2050: 9. 2 billion people. Growth is due to fertility and life expectancy: although fertility rates are falling slowly, infant mortality rates are falling quickly, fertility (developing nations): 4. 63 now; 2. 5 in 2050. Water pollution can come from 2 sources: point-source pollutants enter a waterway at a specific point (e. g. pipe, culvert, ditch) March 24, 2016: nonpoint-source pollutants seep into the water from broad areas of land (e. g. chemical run-off from farmers" fields, septic leaks, landfill sites) Most contaminants (98% bacterial, 80%+ synthetic) come from nonpoint sources.
