Ch. 5Ch. 5Sec. 5Sec. 5

Cancer & the Cancer & the EnvironmentEnvironment

Objectives:1.How can people’s environments affect their risk of cancer?

2.What are three carcinogens found in the environment?

chimney sweeps in Londonchimney sweeps in London

usually poor boysusually poor boyssoot ground into soot ground into skinskin

developed skin developed skin cancercancer

Mary Poppins-Chim Chim Cher-ee song

Dr. Percival PottDr. Percival Pott

recommended chimney sweeps recommended chimney sweeps bathe frequently to clean off sootbathe frequently to clean off soot

1 of 11 of 1stst scientists to understand scientists to understand environment can affect people’s environment can affect people’s healthhealth

Scientists identified the Scientists identified the carcinogens in soot.carcinogens in soot.

They are theThey are the samesame substances that make substances that make upup the tar inthe tar in

cigarette cigarette smoke.smoke.

EPAEPA EEnvironmental nvironmental PProtection rotection AAgencygency purpose:purpose:

enforce environmental lawsenforce environmental laws identify environmental identify environmental carcinogenscarcinogens

develop strategies for protecting develop strategies for protecting peoplepeople

ultraviolet lightultraviolet light decrease in protective ozone decrease in protective ozone

layer - allows more UV light layer - allows more UV light to reach Earthto reach Earth

increase in skin cancerincrease in skin cancer

Ozone hole is getting larger Ozone hole is getting larger each year!each year!

What is causing the depletion What is causing the depletion of the ozone layer?of the ozone layer?

release of release of chlorofluorocarbons chlorofluorocarbons (CFCs) (CFCs)

CFCs given off by CFCs given off by refrigerators, air refrigerators, air conditioners & conditioners & aerosol cans.aerosol cans.

skin cancer can result from overexposure to the sun

Skin Cancer (2:38)

vinyl chloridevinyl chloride colorless gas colorless gas makes PVCmakes PVCvapors cause liver, vapors cause liver, brain or lung cancerbrain or lung cancer

arsenicarsenicwood wood preservative & preservative & pesticidespesticides

2004-EPA 2004-EPA banned use in banned use in wood wood

arsenicarsenic UV UV lightlight

vinyl vinyl chloridechloride

chimney sweeps in chimney sweeps in LondonLondonusually poor boysusually poor boyssoot ground into soot ground into skinskin

developed skin developed skin cancercancer

ultraviolet lightultraviolet lightdecrease in protective decrease in protective

ozone layer - allows more ozone layer - allows more UV light to reach EarthUV light to reach Earth

increase in skin cancerincrease in skin cancer

Dr. Percival PottDr. Percival Pott

recommended chimney sweeps recommended chimney sweeps bathe frequently to reduce risk of skin bathe frequently to reduce risk of skin cancercancer

1 of 11 of 1stst scientists to understand scientists to understand environment can affect people’s environment can affect people’s healthhealth

EPAEPAEnvironmental Protection AgencyEnvironmental Protection Agency

What does What does the EPA do?the EPA do?

enforce environmental lawsenforce environmental laws identify environmental identify environmental

carcinogenscarcinogensdevelop strategies for develop strategies for

protecting peopleprotecting people

What is causing the depletion What is causing the depletion of the ozone layer?of the ozone layer?

release of release of chlorofluorocarbons chlorofluorocarbons (CFCs) (CFCs)

CFCs given off by CFCs given off by refrigerators, air refrigerators, air conditioners & conditioners & aerosol cans.aerosol cans.

causecause effecteffect