Envi Sci 1.1

1
Envi Sci 1.1
2
Early Humans hunters/gatherers - affected the
environment as they burned prairies to flush
prey, and spread plant species through
defecationit is a theory that
over-hunting of some species (plus rapid
climate change!) led to extinctions of giant
bison, mastodon, saber-tooth tiger
3
(No Transcript)
4
Agricultural Revolution (Neolithic ) -
Settlements early humans stop wandering in
search of food. Less physical stress,
safer. - Specialization in settlements, jobs
such as weapon tool making, shelter-building,
clothing, medicine(sic), etc. - go to those who
perform them best.
5
(No Transcript)
6
Technology primitive tools such as hand axes,
bone needles, grinding stones, fishing nets
increase efficiency.
7
Agricultural Revolution - increased
population steady food supply (farm land
supports more humans than hunting, per acre)
through agriculture leads to population
growthwhich results in a CONCENTRATION of human
environmental pressure on local areas.

8
Agricultural Revolution - Slash burn quick
way to convert forest and wetland into farmland
(nutrients from burned trees fertilize the soil),
but it causes habitat destruction for all the
organisms that used to live there, and eventually
results in soil wastage as the nutrients get used
up in crops, and erosion. it is still used
today in less-developed countries.

9
(No Transcript)
10
Agricultural Revolution - Domestication of
plants/animals all modern-day food products were
once wild- humans have tamed shaped nature to
better suit human needs.
11
(No Transcript)
12
Industrial Revolution

• (Envi Sci is concerned with the problems
  caused by the Industrial Rev...)
• (thanks to modern science for making it all
  possible...)

13
(No Transcript)
14
Industrial Revolution
15
energy shift humans stop using animal muscle
running water to do work begin using fossil
fuel. (coal...oil...gas...)
16
in agriculture it takes fewer workers and uses
less land but increased food yield results
17
in manufacturing more product, lower cost
18
in transportation able to move goods greater
distances/more markets
19
Industrial Revolution Pros

• PRO

• Increased QOL quality of everyday life got
  better creature comforts in all areas
• Increased opportunity education a trade
• Decreased starvation
• Better medical care
• Better sanitation

20
Industrial Revolution Cons

• CON

• Urbanization farmers move to town for factory
  jobs.
• Pollution undesired change in air, water or soil
  that adversely affects health survival of
  humans other orgs.
• Exploitation (people nature) deprivation of
  basic dignity.
• Habitat destruction cities, roads, suburbs crowd
  out existing orgs.
• Synthetic materials man-made fertilizer,
  plastic, pesticides, etc not naturally
  occuring.
• Human Population Growth the more humans there
  are, the more natural resources they need
  environment is stressed.

21
The Big Three (Main Environmental Problems)

• Resource Depletion
• Renewable solar, water wind power fresh air,
  fresh water, trees, crops, soil
• Nonrenewable fossil fuel, minerals
• Pollution
• undesired change in air/water/soil which
  adversely affects health, survival activities
  of humans and/or other orgs
• Loss of Biodiversity
• Decrease in the variety and population of wild
  species in a given area

22
Thanks for your kind attentio.