Objective: Section 18-8 to 18-9 Describe stratospheric ozone depletion and solutions to protect the ozone layer.

Objective: Section 18-8 to 18-9Objective: Section 18-8 to 18-9

Describe stratospheric ozone depletion and solutions to protect the ozone layer.

Describe stratospheric ozone depletion and solutions to protect the ozone layer.

Ozone SchmozoneOzone Schmozone

What is ozone?

Do I really need to care?

What is ozone?

Do I really need to care?

Ozone Formation in the StratosphereOzone Formation in the Stratosphere

ImportanceImportance Absorbs UV Terrestrial life

Absorbs UV Terrestrial life

Ozone Depletion in the StratosphereOzone Depletion in the Stratosphere

Fig. 18-26 p. 473Fig. 18-26 p. 473

DepletionDepletion O3 + CFCs → O2 + CFCs + O O3 + CFCs → O2 + CFCs + O

CFCs destroying ozone animation.

Ozone Depleting ChemicalsOzone Depleting ChemicalsChlorofluorocarbons (CFCs)Chlorofluorocarbons (CFCs)HalonsHalonsMethyl bromideMethyl bromideCarbon tetrachlorideCarbon tetrachloride

Methyl chloroform

Methyl chloroform

Hydrogen chloride

Hydrogen chloride

Seasonal Thinning at the PolesSeasonal Thinning at the PolesOzone thinning (hole)Ozone thinning (hole) Polar vortexPolar vortex

Fig. 18-30 p. 475Fig. 18-30 p. 475

Reasons for ConcernReasons for Concern Increased incidence and severity of sunburn Increased incidence and severity of sunburn

Increase in eye cataracts Increase in eye cataracts Increased incidence of skin cancer Increased incidence of skin cancer

Immune system suppression

Immune system suppression

Increase in acid deposition

Increase in acid deposition

Lower crop yields and decline in productivity

Lower crop yields and decline in productivity

Solutions: Protecting the Ozone LayerSolutions: Protecting the Ozone Layer

CFC substitutesCFC substitutesTechnofixes Technofixes Montreal

Protocol

Montreal Protocol

Fig. 18-33 p. 479Fig. 18-33 p. 479

Solutions: Protecting YourselfSolutions: Protecting YourselfCommon

sense

Common sense

GeneralizationGeneralization What chemicals play a major role in ozone

thinning?

Summarize the destruction of stratospheric ozone.

What is the best solution for preventing ozone thinning?

What chemicals play a major role in ozone thinning?

Summarize the destruction of stratospheric ozone.

What is the best solution for preventing ozone thinning?

Objective: Section 18-8 to 18-9Objective: Section 18-8 to 18-9

Describe stratospheric ozone depletion and solutions to protect the ozone layer.

Describe stratospheric ozone depletion and solutions to protect the ozone layer.