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The Influence of Human Activity on the
Environment
BY: Akashdeep Singh Jandu
Improvements in agriculture health and medicine have
produced a dramatic rise in the human population
This increase in population size leads to an increase in
pollution and higher demand for the world’s resources
Humans are using up the earth’s resources, including
fossil fuels.
Burning fossil fuels in cars and power stations produces
carbon dioxide, sulphur dioxide and other greenhouse
gases
• carbon dioxide traps heat in
the atmosphere and causes
the temperature of the
earth to rise.
• This leads to disruption of
the weather patterns eg
drought, floods
• Some weeds may thrive on
the extra carbon dioxide
while other plants are killed
Sulphur dioxide will dissolve in rain producing Acid Rain
• Acid rain damages trees and pollutes rivers and lakes.
Acid rain causes erosion of buildings
and statues particularly if they are made of limestone
Deforestation
• In may countries people
are chopping down
forests to provide
timber or space for
agriculture for the
growing population
This causes several problems
1. Burning the timber increases the level of
carbon dioxide in the air
2. Less trees means less carbon dioxide
absorbed for photosynthesis
3. Soil is eroded as it is exposed to the wind
and rain
4. Less water is transpired into the atmosphere
5. Many animal and plant habitats are
destroyed causing extinction of species
Intensive Farming
• Farming has become more intensive to provide
a higher % yield from land
• Many people regard intensive farming of
animals to be cruel
• In order to produce more food from the land
farmers have to use more fertilisers and
pesticides
Problems with Fertilisers
• Fertilisers enable farmers to grow more food
as they are replacing the nutrients removed
from the soil by plants
• However, if too much fertiliser is added and
it then rains, the fertiliser finds its way into
rivers and lakes
• This causes the water plants to grow and as
there is competition for light, some will die
• Bacteria decay the dead
plants and in so doing
use up oxygen from the
water
• This means the fish
suffocate and die
• This process is called
Eutrophication
• Raw sewage pumped into
rivers has the same
effect
Pesticides
• Pesticides kill insects that will damage crops
• They also kill harmless insects or can get
washed into rivers and pollute the water
• They may even end up in the food chain
In the 1960s, DDT in the food chain threatened bird
populations.
Many birds of prey came close to extinction
What can we Do?
Organic Farming?
• This produces less food
and is more expensive
but it does not produce
the pollution problems
of intensive farming
Use farmyard manure as a fertiliser and set
aside land for growth of wild plants
Biological Control of Pests
• This means using natural
predators to eat pests
instead of pesticides
• It does not have
harmful effects
Develop alternative energy sources
• Conserve our rapidly
diminishing fossil fuel
reserves by using solar
power or wind power
Benefits of conserving endangered species
• Ecotourism
• Agricultural benefits
• Species indicators
• Maintaining diversity in
gene pool
• WHAT ELSE?????????
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Akashdeepsinghjandu10

  • 1. The Influence of Human Activity on the Environment BY: Akashdeep Singh Jandu
  • 2. Improvements in agriculture health and medicine have produced a dramatic rise in the human population This increase in population size leads to an increase in pollution and higher demand for the world’s resources
  • 3. Humans are using up the earth’s resources, including fossil fuels.
  • 4. Burning fossil fuels in cars and power stations produces carbon dioxide, sulphur dioxide and other greenhouse gases • carbon dioxide traps heat in the atmosphere and causes the temperature of the earth to rise. • This leads to disruption of the weather patterns eg drought, floods • Some weeds may thrive on the extra carbon dioxide while other plants are killed
  • 5. Sulphur dioxide will dissolve in rain producing Acid Rain • Acid rain damages trees and pollutes rivers and lakes.
  • 6. Acid rain causes erosion of buildings and statues particularly if they are made of limestone
  • 7. Deforestation • In may countries people are chopping down forests to provide timber or space for agriculture for the growing population
  • 8. This causes several problems 1. Burning the timber increases the level of carbon dioxide in the air 2. Less trees means less carbon dioxide absorbed for photosynthesis 3. Soil is eroded as it is exposed to the wind and rain 4. Less water is transpired into the atmosphere 5. Many animal and plant habitats are destroyed causing extinction of species
  • 9. Intensive Farming • Farming has become more intensive to provide a higher % yield from land • Many people regard intensive farming of animals to be cruel • In order to produce more food from the land farmers have to use more fertilisers and pesticides
  • 10.
  • 11. Problems with Fertilisers • Fertilisers enable farmers to grow more food as they are replacing the nutrients removed from the soil by plants • However, if too much fertiliser is added and it then rains, the fertiliser finds its way into rivers and lakes • This causes the water plants to grow and as there is competition for light, some will die
  • 12. • Bacteria decay the dead plants and in so doing use up oxygen from the water • This means the fish suffocate and die • This process is called Eutrophication • Raw sewage pumped into rivers has the same effect
  • 13. Pesticides • Pesticides kill insects that will damage crops • They also kill harmless insects or can get washed into rivers and pollute the water • They may even end up in the food chain
  • 14. In the 1960s, DDT in the food chain threatened bird populations. Many birds of prey came close to extinction
  • 15.
  • 16. What can we Do?
  • 17. Organic Farming? • This produces less food and is more expensive but it does not produce the pollution problems of intensive farming
  • 18. Use farmyard manure as a fertiliser and set aside land for growth of wild plants
  • 19. Biological Control of Pests • This means using natural predators to eat pests instead of pesticides • It does not have harmful effects
  • 20. Develop alternative energy sources • Conserve our rapidly diminishing fossil fuel reserves by using solar power or wind power
  • 21. Benefits of conserving endangered species • Ecotourism • Agricultural benefits • Species indicators • Maintaining diversity in gene pool
  • 23. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.