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Global Warming

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Title: Global Warming Author: Library User Last modified by: vicente Created Date: 2/27/2009 4:07:57 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: Global Warming


1
The World We CreateNATS 101Section 6
Next homework available in D2L!
03/04
2
UNIT 2 Global Warming, Natural or Man-Made?
3
Some Data
The average temperature in our planet is
increasing, BUT it has happened before.
4
Some Data
oC
Solar activity has had a strong correlation with
Earths temperature, BUT not in present times.
5
Some Data
CO2 concentrations in the atmosphere always
correlate very strongly with the average
temperature, BUT CO2 increases tend to lag with
respect to T increases.
6
Some Data
CO2 is a minor component of the atmosphere, BUT
is a potent greenhouse gas involved in many
natural cycles in our planet.
7
Mini-Debate
Each team will split into two groups One group
will support the position that human actions are
the main contributing factor to global warming,
while the other group will support the position
that the cause of global warming is due to
natural occurrences. Use information you learned
today in class to support your arguments.
At the end of the debate, take a poll to
determine the overall teams position on this
issue.
8
Effects?
Since the late 1800s, the average temperature of
Earth increased 0.4-0.8 oC (thats 0.7-1.4 oF)
9
Effects of Global Warming
Climate
10
Is global warming affecting hurricanes?
In your groups interpret the data provided and
answer the questions on the worksheet.
You have 5 minutes
11
Extreme Weather
Hurricanes
Sand storms
Tornadoes
12
Glacial Melting
Scientists predict that if the current rate of
global warming continues, the Arctic could be
ice-free in the summer by 2040. Rising global
temperatures speed the melting of glaciers and
ice caps Sea ice helps maintain the cold
temperatures of the underlying water.
13
(No Transcript)
14
This melting is one cause for the rise in sea
levels.
Current rise in sea level is 1.8mm per year.
15
Flooding
  • Sea-level has risen about 130 meters (400
    ft) since the peak of the last ice age about
    18,000 years ago.
  • 50 million people worldwide could become
    environmental refugees by 2010, displaced
    by rising sea levels, depleted aquifers and
    intermittent river flooding.

16
Wildfires
The snow is melting earlier in the year ? much
longer fire seasons in Arizona. Warmer
temperatures promotes outbreaks of tree-eating
beetles which help fuel forest fires
17
Effects of Global Warming
  • Life Biodiversity

18
The Predicament of the Painted Turtle
In pairs interpret the graph and answer the
questions on the worksheet. Once you are
finished compare your data with the rest of your
group. You have 5 minutes
19
Biodiversity
In general, biodiversity decreases as temperature
increases
20
Ecosystems and Species
  • Species that cannot adapt go extinct.
  • Antarctic penguin populations have shrunk
    by 33 percent
  • In California, shoreline sea life is shifting
    northward.

21
Arctic
  • Two-thirds of the world's polar bear
    sub-populations will be extinct by mid-century
    due to Arctic ice cap melting.

22
Tropics
Habitats drying out. Tropical forests give off
more CO2 than they take up. Rise in CO2 changes
composition of the forest .
23
What should we do?
24
How do we make decisions?
25
Risk Assessment
The determination of quantitative or qualitative
value of risk related to a concrete situation and
a recognized threat. A tool to help make the
best informed decisions by weighing the pros and
cons
26
Why Assess Risk?
  • Make the best informed decisions
  • Understand potential consequences for each
    scenario
  • Awareness of how to prepare for risks
  • Realization of costs involved

Example H1N1 Vaccine
27
H1N1 Facts
  • The H1N1 is a pandemic flu virus.
  • The people that should be vaccinated
  • Children 6 months to 24 years old, anyone over
    50 and pregnant women.
  • The vaccine is 92 effective in pregnant women
    and depending on the person, two shots may
    be required.
  • The vaccine itself is free, but the provider
    charges an administration fee.
  • H1N1 is very contagious!

Remember that you are a student that has limited
time and funds, and go to a school with almost
40,000 students. What could be some of the
possible outcomes for either getting or not
getting the vaccination?
28
Climate Change Risks?
How can you use Risk Assessment to make a
decision concerning what to support in the debate
about Global Climate Change?
  • To Keep in mind
  • Average temperatures are actually increasing
  • A majority of scientist think current climate
    change is human induced. However, there many
    people that disagree
  • Consequences of global climate change could be
    devastating
  • Taking action could be very costly, particularly
    for developing nations.

29
Global Climate Change Risk Assessment
Using your knowledge about global warming, you
need to complete a risk assessment which clearly
shows the consequences of taking action or not
taking action against global warming. Consider
the political, social, economic, and
environmental aspects
You have 10 minutes
30
Global Climate Change Risk Assessment
Based on your completed risk assessment, what
will you decide and why? What is the main factor
influencing your decision? How might you follow
through with this decision?
You have 3 minutes
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