How the Environment is directly & indirectly affected by Environment

1. Impact of
Science and Technology
on
Environment

2. Direct or Intentional Impacts
Indirect or unintentional
Impacts

3. Direct or Intentional Impacts
Application of Chemical Fertilizers,
Pesticides and Insecticides
High yield
Economic Development
Change in Soil Chemistry
Soil Degradation

4. Indirect or unintentional Impacts
• Experienced after long time when
they become cumulative
• Not reversible
• Related to pollution and
environmental degradation

5. • Use of chemicals such as DDT, BHC, etc.,
• Excessive use of pesticides, fertilizers
and a number of other chemicals
• Example: toxic materials are transported
across the placenta and reach the
developing foetus of women and cause
abortions and delivery of premature
child

6. Industrial Growth and its
Environmental Impacts
• Industrial expansion – release of
enormous quantities of pollutants –
ions of chlorine, sodium sulphate,
magnesium phosphate etc
• Coal consumption in thermal plants
– flyash, smoke, sulphur oxide and
other gases

7. • Burning of hydrocarbon fuels –
Increased concentration of CO2
in the atmosphere
• Increase in global temperature
• CO2 + H2O H2CO3
• Carbonic acid changes the soil
chemistry

8. O2 + Haemoglobin
Oxyhaemoglobin
Supply of O2
throughout our body
Normal Reaction
Carbon mono-oxide +
Haemoglobin
Prevention of Oxyhaemoglobin
Supply of
Carbon mono-oxide
Abnormal Reaction

9. Nitrates in
food and
water
Nitrites by
bacteria in
digestive
system
Nitrites
enter blood
vascular
system
Combines
with
Haemoglobin
Trigger a
lot of
metabolic
disorders

10. • Industrial wastes – chemicals,
metals, solid wastes and garbage
• Release of CFC (Chloroflurocarbon)
– Depletion of Ozone
• Sulphur dioxide reacts quickly with
Atmospheric moisture – Suphuric
acid – Respiratory diseases and Acid
Rain