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Transcript of Human Health and Environmental Risks. Four categories of human health risks Physical (floods,...
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Human Health and Environmental Risks
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Four categories of human health risks
Physical (floods, blizzards, landslides, radon, UV exposure)
Biological (viruses, bacterial infections)
Chemical (disinfectants, pesticides)
Cultural/Lifestyle (drinking, smoking, bad diet, crime in neighborhood)
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Biological Risks
Infectious diseases- those caused by infectious agents, known as pathogens.
Example: pneumonia and Flu
Also referred to as: transmissible, contagious or communicable diseases.
Where you live and your level of poverty may increase the probability of contracting some infectious diseases.
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Biological Risks
Epidemic – An outbreak of an infectious disease that is limited to one area or region.
Pandemic – If outbreak of a disease spreads globally.
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Biological Risks
Chronic disease- slowly impairs the functioning of a person’s body.
Acute diseases- rapidly impair the functioning of a person’s body.
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Historical Diseases
Plague
Malaria
Tuberculosis
Cholera
Dysentery
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Emergent Diseases HIV/AIDS
Ebola
Mad Cow Disease
Bird Flu
West Nile Virus
SARS
Antibiotic resistant TB
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Agencies
CDC – Center for Disease Control and Prevention (United States)
WHO – World Health Organization (global)
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Solutions for Reducing Infectious Disease
Improving drinking water conditions in developing countries
Decreasing malnutrition to improve immune system
Implementing global education programs to prevent HIV/AIDS
Increasing availability to vaccines/antibiotics
Reducing unnecessary use of antibiotics in humans and livestock
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Chemical Risks
Toxicology – Study of the detrimental effects of chemicals on both humans and wildlife
Key characteristics that cause a chemical to be toxic include: Persistence – not easily degraded/broken downSolubility – fat soluble chemicals will accumulate in body tissues, water soluble chemicals will be dissolved easily in bodies of waterBiomagnification – Increased concentration of chemical through the food chain.
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Bioaccumulation
bioaccumulation- an increased concentration of a chemical within an organism over time
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Biomagnification
Biomagnification- the increase in a chemical concentration in animal tissues as the chemical moves up the food chain.
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Dose-Response Studies LD50- lethal dose that kills 50% of the
individuals
ED50- effective dose that causes 50% of the animals to display the harmful but nonlethal effect (referred to as sublethal effects)
Because of the short duration of these experiments, referred to as acute studies
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Synergistic interactions- when two risks come together and cause more harm that one would. For example, the health impact of a carcinogen such as asbestos can be much higher if an individual also smokes tobacco.
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Dose-response curve
LD50 = dose lethal to 50%
of test animals
Threshold = dose at which response begins
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Do The MathBased on a LD50 pesticide study on a rat, what amount of the pesticide would be considered safe for a mammal?
LD50 ÷ 10 (mammal) LD 50 = 2mg/kg of mass ÷ 10 = 0.2 mg/kg of mass
LD50 ÷ 1000 (humans)
LD 50 = 2mg/kg of mass ÷1000 = 0.002 mg/kg of mass
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Problems with Toxicity TestingThere are many issues in accurately assessing toxicity of chemicals….Genetic Variability – individuals can exhibit different response to a given level or type of chemicalTest only one response to one chemical at a time, difficult to determine synergistic effectsType of exposure may effect response (acute versus chronic) Regulating agencies may rely on Industry sponsored research
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Chemical Risks Neurotoxins- chemicals that disrupt the nervous
system
Carcinogens- chemicals that cause cancer
Teratogens- chemicals that interfere with the normal development of embryos or fetuses
Allergens- chemicals that cause allergic reactions
Endocrine disruptors- chemicals that interfere with the normal functioning of hormones in an animal’s body
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Routes of Exposure
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Many health hazards exist indoors
• Substances in plastics and consumer products
• Lead in paint and pipes
• Radon
• Asbestos
• PBDE fire retardants
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Chemical Sources Type Effects
Arsenic Mining, Groundwater, Treated wood products
Carcinogen Cancer
Asbestos Building Insulation Carcinogen Lung Cancer
Radon Soil, Water, Bedrock Carcinogen Lung Cancer
Vinyl Chloride Industry, water from vinyl chloride pipes
Carcinogen Cancer, especially liver cancer
PCBs (Polychlorinated biphenyls)
Industry (electrical insulator, fire retardant, pesticides, adhesives)
Carcinogen Cancer
Phthalates Used in production of plastics and as solvents
Carcinogen Reproductive damage and cancers
Bisphenol A Used in production of plastic bottles and food containers
Carcinogen Reproductive cancers
Benzene Emissions from burning coal , tobacco smoke
Carcinogen Cancer
Dioxins Class of chemical compounds in manufacturing of some herbicides
Carcinogen Bioaccumulates, causes cancer
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Chemical Source Type Effects
Thalidomide Morning Sickness Medication prescribed in the early 1960s
Teratogen Birth Defects
Alcohol Alcoholic beverages Teratogen Fetuses with reduced fetal growth, brain damage
Benzene Emissions from burning coal and oil, tobacco smoke
Teratogen Long term exposure can cause birth defects
Vinyl Chloride Precursor to making PVC
Teratogen Birth Defects
The drug thalidomide, used to relieve nausea during pregnancy, turned out to be a potent teratogen, and caused thousands of birth defects before being banned in the 1960s.
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Chemical Source Type Effect
Lead Paint, gasoline Neurotoxin NS disorders, Death
Mercury Coal burning, fish consumption, batteries, fluorescent lights, smelting, incineration of municipal waste
Neurotoxin Brain damage
Heavy Metals (lead, mercury, Arsenic, Cadmium)
Neurotoxin/Teratogen
Biomagnify through food chain and cause neuological damage especially in fetuses
PCB’s Industry, electrical insulators, fire retardants, adhesives, pesticides
Neurotoxin/Teratogen
Brain damage, especially in fetuses
Vinyl Chloride Precursor to PVC Neurotoxin Brain damage
Bisphenol A Plastic bottles and containers
Neurotoxin Neurological damage
http://www.youtube.com/watch?v=ihFkyPv1jtU
Link – Minamata Disease
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Chemical Source Type Effect
Atrazine Herbicides Endocrine Disruptor Feminization of males, low sperm count, damage to sexual development , reduced penis size, having both male and female sex organs
DDT Pesticide Endocrine Disruptor Biomagnifies, reproductive damage, thin egg shells, cancers in birds
Phthalates Production of plastics, solvent in some cosmetic products
Endocrine Disruptor Feminization of males, low sperm count, damage to sexual development , reduced penis size, having both male and female sex organs
Frogs show reproductive abnormalities in response to small doses of the herbicide atrazine, researcher Tyrone Hayes has found.
Others suggest that atrazine may have effects on humans as well, lowered sperm count, may also be linked to increasing incidence of breast and testicular cancers.
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Endocrine Disruptor
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Well Known Case Studies
• Love Canal Housing Development in Niagara Falls, New York – Hazardous waste chemicals buried in old canal leaked into homes, school yard, soil, and ground water. Led to the passage of Comprehensive Environment Response Compensation and Liability Act (CERCLA) aka “Superfund Act”
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Well Known Case Studies
Minamata, Japan – mental impairments, birth defects, and deaths caused by mercury dumped in Minamata Bay by a factory. The mercury was converted to methylmercury, bioaccumulated in fish, and biomagnified through food chains. Mercury entered humans who ate a traditional fish based diet.
http://www.youtube.com/watch?v=ihFkyPv1jtU
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Know Well Known Case Studies
Bhopal, India – On December 2, 1984, poisonous methyl isocyanate gas was released accidentally by a Union Carbide pesticide plant killing about 5,000 people and causing serious health effects for 50,000 - 60,000.
http://www.youtube.com/watch?v=ELllSxnDS0g
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Risk• Risk = the mathematical probability that some
harmful outcome will result from a given action, event, or substance
• Probability = a quantitative description of the likelihood of a certain outcome
• Harmful outcome could be defined as injury, death, environmental damage, economic loss, etc.
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Perception different from realityOur perception of risks tends not to match statistical reality.
smoking
plane
crash
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Risk assessment•Analyzes risks quantitatively
•Measures and compares risks involved in different activities or substances
•Helps identify and prioritize serious risks
•Helps determine threats posed to humans, wildlife, ecosystems
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Risk assessmentInvolves:• Dose-response
analysis or other tests of toxicity
• Assessing likely exposure to the hazard (concentration, time, frequency)
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Risk management• Consider risk
assessments in light of social, economic, and political needs and values.
• Weigh costs and benefits, given both scientific and nonscientific concerns.
• Decide whether or not to reduce or eliminate risk.
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Risk assessment and risk management inform policy
Following risk management, policy decisions are made.
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Philosophical approaches
•“Innocent until proven guilty”:Assume harmless until shown to be harmful
•Precautionary principle:Assume harmful until shown to be harmless
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Implications for product testing
•“Innocent until proven guilty”:• Industry can introduce any products it
wants.
• Government bears the burden of proof to show if products are dangerous.
•Precautionary principle:• Industry cannot introduce a product until it
is very thoroughly tested and shown convincingly to be harmless.
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Implications for product testing
• Industry has pressured government to take an “innocent-until-proven-guilty” approach.
• Environmental advocates have pressured government to follow the precautionary principle.
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Stockholm Convention
In 2001, a group of 127 nations gathered in Stockholm, Sweden, to reach an agreement on restricting the global use of some chemicals
12 chemicals were to be banned, phased out, or reduced (aka “dirty dozen”)
These include DDT, PCBs, and certain chemicals that are by-products of manufacturing processes.
International Treaty – Persistent Organic Pollutants Treaty (POPs)
Signed but not ratified by United States