Your group letter is on your desk 23 per group Take an index card with writing and a blank index car

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Your group letter is on your desk!2-3 per group
Take an index card with writing and a blank index
card

• You have 10 minutes to
• 1. copy the card onto a new index card- including
  your group names.
• 2. Answer/define/give the main idea for your
  topic as briefly as possible
• 20 minutes- to include your main ideas on the
  PowerPoint
• Either type or write
• I will help with this part

4
Overpopulation Effects of Environment

• By 2050 if population reaches 9 billion there
  will be serious damage to the environment as well
  as the global economy.
• Hopefully technology and science will help
  prevent the negative impacts.

5
Forest Resources

• Deforestation-(loss of forests) leads to severe
  erosions as soil is exposed to heavy rains
  (erosions can also wash away nutrients in top
  soil.)
• Sustainable use- mature trees can be harvested
  selectively to promote the growth of younger
  trees and preserve the forest ecosystem.
• Tree genetics are also breeding new
  faster-growing tree varieties that produce
  high-quality wood.

6
Introducing New Species

• Introducing new species is when humans transport
  a species new to that environment to an area.
• This is harmful to the environment because there
  are no natural predators to hunt the new species
  and the new species might have advantages over
  the native species.
• Examples Zebra mussels and leafy Spurge are
  brought from Europe to New York.

7
Water Resources

• Oil Spills improperly discarded chemicals enter
  streams and rivers.
• Domestic Sewage wastewater from sinks and
  toilets contain nitrogen and phosphorous
  compounds that can encourage the growth of
  bacteria and algae in aquatic habitats.

8
Effects of Humans on Land Resources

• Desertification- in areas with dry climates a
  process caused by a combination of poor farming
  produces overgrazing and drought that turns
  productive land into desert.
• Soil Erosion- the wearing away of surface soil by
  water and wind.

9
Global Warming

• Global warming the term used to describe the
  increase in the average temperature of the
  biosphere.
• Cause The most widely accepted hypothesis that
  human activities have caused global warming by
  adding carbon dioxide and other green house gas
  such as methane into the atmosphere. As result
  global atmospheric green house retain more heat.
• Effect
• Environmental change
• Polar ice caps will melt
• Rise of sea levels
• Weather disturbances.

10
Oceans Resources

• People depend on the ocean as a major source of
  protein both from finfish.
• The annual world fish catch grew about 20 million
  tons to more than 90 million tons between 1950-
  1990
• Fisheries are being harvesting faster than they
  can reproduce.
• Aquaculture- the farming of aquatic organisms
• Fish catches kept rising
• Earths oceans are particularly valuable for the
  food resources they contain.

11
Biological Magnification

• Increasing concentration of a harmful substance
  in organisms at a higher trophic levels in a food
  chain or food web.
• Example DDT is a pesticide that eliminates
  disease-carrying mosquitoes insects and is
  cheap enough to spray on a whole agricultural
  field. However the non-biodegradable substance
  gets into producers which are passed onto those
  of a higher trophic.

12
Renewable vs Non renewable

• Renewable resources can regenerate and are
  replaceable
• Non renewable are not replenished by natural
  processes
• Human activities affect the supply and quality of
  renewable resources.

13
Ozone Depletion

• Ozone depletion is the depletion of the ozone
  layer.
• Caused by compounds called CFCs. They act as
  catalysts that enable UV light to break apart
  ozone molecules
• The effect of this is that the ozone layer now
  allows most of the UV rays to reach the earths
  surface.

14
AIR RESOURCES

• Pollutant- A harmful material that can enter the
  biosphere through the land air or water
• Smog- A mixture of chemicals that occurs as a
  gray-brown haze in the atmosphere.
• Acid Rain- Can kill plants by damaging their
  leaves and changing the chemistry of soils and
  standing water ecosystems.

15
Threats to Biodiversity

• Habitat Alteration/Fragmentation- Occurs when
  humans destroy an environment or build in it
  dividing it into smaller pieces. On these small
  pieces there is less biodiversity due to size as
  a limiting factor.
• Demand for Wildlife products- Humans have used
  animals and plants in various products for a very
  long time and arent about to stop now.
  Over-hunting of animals for their furs meat and
  other parts has lead to many species becoming
  extinct.