![Page 1: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/1.jpg)
![Page 2: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/2.jpg)
Man affects his Man affects his Environment through Environment through
the change of:the change of:
![Page 3: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/3.jpg)
![Page 4: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/4.jpg)
• atmospheric carbon dioxide concentration increases
• soil erosion by heavy rain or strong wind•no root to hold soil particles together•soil being washed into rivers fills up the river bed causes flooding
DeforestationDeforestationEffects on Environment :
![Page 5: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/5.jpg)
• destroys natural habitats & causes loss of species
•cause extinction of species because of destruction of natural habitat
•loss of important medicines
DeforestationDeforestationEffects on Environment :
![Page 6: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/6.jpg)
MonocultureMonoculture
• increase in pest population ∵monoculture enables pests to have continual supply of food
• exhaustion of particular type of minerals ∵the same type of plants draws particular types of mineral from the soil for a long time
Effects on Environment :
![Page 7: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/7.jpg)
Definition: Any undesirable change in the environment caused by Human Activities
![Page 8: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/8.jpg)
Smoke & Exhaust Fumes
Domestic Wastes
Agricultural Wastes
Industrial Wastes
Noise
![Page 9: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/9.jpg)
Effect of Pollutants on
Human Health & the Environment
![Page 10: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/10.jpg)
Carbon Monoxide• form carboxyhaemoglob
in permanently with haemoglobin in blood which reduces the oxygen-carrying capacity of blood
• Health Effect: slow response, fainting and even death
Smoke & Exhaust Smoke & Exhaust FumesFumes
![Page 11: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/11.jpg)
Carbon Dioxide• accounts for Greenhouse Effect• causes melting of polar ice increases
in sea level causes flooding of cities
![Page 12: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/12.jpg)
Carbon Particles : Environmental Effect: cover plants &
make them unable to carry out gaseous exchange & photosynthesis
Health Effect: cause respiratory diseases
Lead : from cars Health Effect: affect
mental development of baby & child, cause headache, irritability, fatigue & depression
![Page 13: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/13.jpg)
Sulphur Dioxide & Nitrogen Dioxide Environmental Ef
fect: produce acid rain which is corrosive to buildings and plants & fish are unable to survive in acidic conditions
Acid rain
Acid leachin
g
Acid snow
Dry fallout
Die off of aquatic
life
SO2 & NOx
H2SO4 & HNO3
![Page 14: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/14.jpg)
Smog Formation– pollutants trapped by a layer of warm air
above so that it cannot rise and disperse
– a mixture of poisonous gases & fog
– Health Effect: irritates eyes & lungs
– Environmental Effect: toxic to plants
CFCs (chlorofluorocarbons)– Environmental Effect: reduce amount of
ozone in atmosphere
– Health Effect: increase chances of skin cancer
![Page 15: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/15.jpg)
Domestic WastesDomestic WastesRubbish
– Environmental Effect: give off bad smell & attract pests
Metal Cans & Plastics– Environmental Effect:
non-biodegradable which needs plenty of space for landfilling
![Page 16: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/16.jpg)
Detergents– Environmental Effect: create foam on surface, decrease oxyge
n content in rivers, living organisms suffocate & die
increase phosphate ions, cause algal bloom (eg. red tides)
– affect the functioning of sewage treatment plant by killing micro-organisms which the treatment depends
![Page 17: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/17.jpg)
Agricultural WastesAgricultural Wastes Inorganic Fertilizers
– Environmental Effect: cause rapid growth of algae (e.g. red tides) use up lots of O2 in water fish & other organisms die from suffocation
![Page 18: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/18.jpg)
Manure– Environmental Effect: decomposers increase rapidly due to
sufficient food supply O2 content in water decreases cause suffocation of fish & other organisms
![Page 19: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/19.jpg)
Industrial WastesIndustrial WastesSoluble Poisonous Heavy Metal Elements
– Environmental Effect: accumulate along the food chain & cause death when in high concentration
![Page 20: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/20.jpg)
Hot Water– Environmental Effect: decreases the solubility of O2 in
water cause suffocation of living organisms
![Page 21: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/21.jpg)
Crude Oil (from wrecked tankers)– Environmental Effect: cover sea surface which reduces light penetra
tion and dissolve O2 amount stick feathers of birds,
making them unable to fly
![Page 22: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/22.jpg)
Sources– domestic– industrial– constructional– traffic
NoiseNoise
Effects:– Health Effect: causes psychological
stress, irritation, nervous fatigue, ear less sensitive & even deafness
![Page 23: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/23.jpg)
Why we need Why we need Conservation ?Conservation ?
∵ rapid growth of population has led to increase in demand for land & thus destruction of natural habitat
![Page 24: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/24.jpg)
ConservationConservation
• Definition :–wise use of natural resources, – least disturbance to the environment and
–give good quality of life to man
![Page 25: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/25.jpg)
Ways of ConservationWays of ConservationRecycling of Used Materials
– e.g. recycle paper & aluminum cansEconomical Use of Natural Resources
– e.g. develop other energy sources like solar energy & nuclear energy
Pollution Control– e.g. content of lead & sulphur in petrol – e.g. install catalytic converter in motor
cars– e.g. sewage treatment
![Page 26: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/26.jpg)
Sewage TreatmentSewage TreatmentSedimentation
– settle down solid substances to form sludge
Decomposition– aerobic respiration of microorganisms
in aeration tank by bubbling air in order to oxidize organic compounds into inorganic compounds
![Page 27: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/27.jpg)
Fermentation– microorganisms in
digester to carry out anaerobic respiration
produce methane gas can be used as fuel to
drive the sewage treatment plant
– dry sludge can be used as fertilizers
Sewage TreatmentSewage Treatment
![Page 28: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/28.jpg)
• Legislation – control the amount of pollutants
discharged• Education
– by mass media (besides normal schooling)
• Birth control– to decrease the stress on resources
Ways of ConservationWays of Conservation
![Page 29: Man affects his Environment through the change of:](https://reader035.vdocuments.us/reader035/viewer/2022081518/5519a7d4550346c9608b4772/html5/thumbnails/29.jpg)
~~ ENDEND
~~