Download 1 Eco - Human Distubrances

Question of the Day
11-30
Do you think climate
change is really
happening? Explain your
view.
Human Disturbances
Climate vs. Weather


What’s the difference?
Weather –
• Primarily deals with temperature, humidity,
wind, rainfall, etc UP TO TWO WEEKS

Climate –
• Primarily deals with temperature, humidity,
wind, rainfall, etc OVER LONG PERIODS OF
TIME
Climate Change – General Info

The majority of greenhouse gasses have
been emitted since the beginning of
• the industrial revolution

The burning of fossil fuels (and biomass)
releases carbon that has been trapped
• for millions of years

This carbon is released in the form of
• CO2

The three main fossil fuels are
• coal, oil and natural gas

Slash and burn farming reduces the
ability of Earth’s forests to soak up the
CO2. This also releases the
• Carbon that was trapped in the trees, into the
atmosphere in the form of carbon dioxide
Population size and Global
Warming


Industrializing nations
What is the main issue with industrializing
nations that have very large populations?
•

They are burning fossil fuels at an
enormous rate (more people = more
pollution)
What are two industrializing nations with
large populations?
•
•
•
China population = 1.3 billion
India population = 1.1 billion
(US population = 300 million)
What is the Greenhouse Effect?:


Greenhouse effect – process which
infrared radiation is trapped near
Earth’s surface, which keeps the
planet warm
Greenhouse gasses:
•
•
•
•
•
•
Carbon dioxide
Methane – come from agriculture
Water Vapor
Ozone
CFC’s
Nitrogen Oxides
2nd Unit # 3 Book Work Assignment:
Read pages 199-205 and
answer Lesson Review #s 16 on page 205
1st Unit # 3 Book Work Assignment:
Read about the
Carbon Cycle (pages 165167) AND study the diagram
on page 166, then answer
questions 1-3 on page 168.
PARTNER = OK
3 OR MORE = NOT OK
Question of the Day
12-1
How are greenhouse gases
produced?
One example of a
greenhouse gas = _____.
Question of the Day
12-1
Describe and interpret
patterns of change in natural
systems.
Analyze patterns of change in
natural systems over time.
Discuss the greenhouse effect.
Evidence of Global Warming…?
What is the greenhouse effect?
http://videos.howstuffworks.co
m/howstuffworks/203-whatis-the-greenhouse-effectvideo.htm
http://greenhouseeffect.com
/videos-a-climate-minutethe-greenhouse[Hi3ERes0h84].cfm
Greenhouse Effect
•
•
MSNBC
http://www.
msnbc.msn.c
om/id/66629
32
Greenhouse Effect



Is the greenhouse effect a good
thing?
• YES – Earth would be much
cooler without it
What is the problem?
• The problem is that TOO much of
the sun’s radiation is being
trapped inside our atmosphere
What is causing the problem?
Climate Protest
CO2 and Temp


What we see is a
positive correlation
between the
temperature and the
levels of Carbon Dioxide
in the atmosphere.
• This means the
more carbon dioxide
there is, the higher
the temperature will
be
Carbon levels are now
at their highest
level in 150,000
years (actually
650,000 years)
Reading the graphs…
Carbon Dioxide Variations
CO2 Concentrations
Average Temp Increase - (Since 1855)

Current Temperature Increase:
• Overall temperature on earth (near the
surface) has increased 1.33 degree
Fahrenheit (± 0.32 F) in the 20th century.
• Models predict that the temperature will rise
a further 2.0 to
11.5 °F in the
21st Century.

Hottest Years in
150 years
• The hottest years
recorded, EVER
since recording
began in 1880
were within the
last 10 years
One thing you
know about
greenhouse
gases?
2nd Unit # 3 Book Work Assignment:
Read pages 199-205 and
answer Lesson Review #s 16 on page 205
1st Unit # 3 Book Work Assignment:
Read about the
Carbon Cycle (pages 165167) AND study the diagram
on page 166, then answer
questions 1-3 on page 168.
PARTNER = OK
3 OR MORE = NOT OK
5-10 ATB


Which greenhouse gas typically
comes from agriculture?
Today:
• Discuss hurricane strength
• Discuss melting arctic ices
Where is the temperature
increase?

Most of the increase is ____near the
poles____
Question of the Day


12-1
Why is slash and burn farming a
“double whammy”?
Objectives:
• Discuss the greenhouse effect
Sea Level Rise

What two factors will cause the sea level to
rise?
• Melting of land ice (why not floating
glaciers?)
• Thermal expansion of the ocean
5-12 ATB


Draw a picture indicating how the
greenhouse effect works. Be sure to
label and include: light waves,
infrared radiation and the
greenhouse gas layer and earth
Today:
• Describe effects of climate change
Shifts in weather patterns


Some areas will get more
precipitation, others less
What causes seasons?
• http://www.youtube.com/watch?v=Dui
QvPLWziQ
Hurricane Strength

As ocean waters
warm, we can
expect to see
• More intense
hurricanes
• Show video
Arctic Ices Shrinking



North Pole ice melts and freezes
each year
BUT, it’s melting more and freezing
less than ever before
http://www.nasa.gov/mpg/134728m
ain_sea%20ice%20yearly_NASA%20
WebV_1.mpg
Effects of Climate Change




Melting land glaciers
Melting arctic ice
Hurricane strength increase
Shifts in weather patterns
ATB 12-22

Figure the phrase in the box
ALL


World
What are three effects will we see
because of global warming?
Today:
• Get out your notes…
• Discuss several actions we can take to
slow global warming