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Do Now:
Write down everything you know or have heard about Global Warming.
Effects of Humans on the
Environment: Climate Change
Hypothesis
Take a moment to write down some hypothesis for what will happen to:
1) The 2 beakers simulating greenhouse effect
2) The glass with ice simulating icebergs and sea ice
3) The glass with ice simulating glaciers and land ice
Why is the Earth warm but Mars and the Moon
are cold?The Greenhouse Effect
The Greenhouse Effect has kept the Earth warm for billions of
years.
Draw a picture to help you
understand how the Greenhouse Effect
works
The problem is, now the greenhouse effect is
more intense and it is making the Earth too
HOT!
Too many carbon emissions (putting CO2 into the air) have put more greenhouse gases into the
atmosphere.
THICKER greenhouse gases have trapped more heat.
This has caused the Earth’s temperature to increase!
Examples of carbon emissions:
a) Burning gas in cars
b) Burning coal/oil in factories
c) Using a lot of electricity
Causes of Global Warming
Burning fossil fuels
Deforestation
Methane (CH4)
Even worse, global warming starts new
processes in motion that SPEED UP warming
Ice caps REFLECT sunlight back into space.
Open ocean ABSORBS sunlight as heat.
As ice caps melt, more light is absorbed than reflected.
As a result, global warming happens more rapidly.
Need more evidence?
11 out of the last 13 years have been the hottest on record.
Ice caps are shrinking:
All scientists agree that
climate change is real
and we must do
something about it
Glaciers Shrinking
1914 2004
Alaska
Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org
Colorado River Arizona
Change over 1 year!
Ice Cores
By drilling into the ice caps and analyzing the layers of ice, scientists can figure out what the climate was like thousands of years ago
This is the data from the last 1000 years
Pair and Share…Stop and Jot
Take a few minutes to summarize the evidence that global warming is occurring. Then, explain which piece of evidence is most alarming to you. Why?
But wait…are Humans really to blame for global warming? Hasn’t
the climate always been changing?
DifferenceGLOBAL WARMING
is the increase of the Earth’s average surface temperature due to a build-up of greenhouse gases in the atmosphere.
CLIMATE CHANGE
is a broader term that refers to long-term changes in climate, including average temperature and precipitation.
Why should we careIncreased Temperature
Habitat Damage and
Species AffectedChanges in Water
Supply
Rising Sea Level
Increased Temperature
Thicker Greenhouse Gases cause increased temperature.
Increased global temperature causes more EXTREME weather. Can be snowier in some
areas, drier in others, more hurricanes
First, lets check out our experiment…
Habitat Destruction and Species
Affected
Sea Level Rise
Sea Ice
Will not cause Sea Level Rise.
However, loss of sea ice will speed up global warming even more.
Land Ice
WILL cause Sea Level Rise
First, let’s check out our experiment
Changes in Water Supply
Global warming DOES NOT decrease the amount of water on the globe
However, global warming DOES change weather patterns and causes droughts in some areas and floods in other places
Even if all this doesn’t convince
you, we should still do something.
Let me show you why…
Ok, what can we do!?
There is no one solution to global warming. In fact, global warming will take a long time to turn around and some effects are inevitable.
We need to make substantial changes to the way we use energy, how our electricity is produced, and how the products we buy are made.
We may even need to find ways of taking CO2 out of the atmosphere!
To see some small ways you can make a difference, we are going to do a GALLERY WALK!
Exit Slip
1) Describe how the greenhouse effect keeps the Earth warm?
2) What are two pieces of evidence for global warming?
3) Why should we care about climate change?