Transcript Global Warming or Greenhouse Effect

Aim: What is Global Warming?
Do Now: What do you already know about global warming?
Causes
Effects
Solutions
Aim: What is Global Warming?
1. What does the graph above show?
It shows how temperature changes over the last 400,000 years within a range
of -10 to 4 C
2. What pattern do you discover in this graph?
There are 4 cycles of temperature increasing and decreasing
Aim: What is Global Warming?
3. Look the graph at the right. What happens during the last 150 years?
Overall, temperature increased 0.7 C since 1870
4. What important even occurred around 1870 in Western Europe?
Industrial revolution
Aim: What Causes Global Warming?
5. What does the graph above show?
Carbon dioxide (CO2) concentration within 160 to 300 ppm over
the past 400,000 years.
6. What pattern do you discover in this graph?
There are four cycles of CO2 increasing and decreasing, each of
them lasted for 100,000 years approximately.
Aim: What Causes Global Warming?
7. What happens during the last 150 years?
What important even occurred around 1870 in Western Europe?
Carbon dioxide concentration increased steadily up to 370 ppm
Industrial Revolution
Aim: What Causes Global Warming?
8. Compare and contrast the two graphs above.
How are both similar? What conclusion can you draw?
Both have the same pattern of 4 cycles that fit together over the last 400,000 years
The relationship is the more CO2 the higher temperature.
Aim: What Do CO2 Emissions Come From?
9. Where the Carbon Dioxide (CO2) is coming from?
Respiration, human activities, volcanic activities
Aim: What Causes Global Warming?
10. Where the CO2 is coming from? What is responsible of CO2 rising levels during the last 150 years?
Burning fossil fuels (oil, natural gas, coal) in power plants, factories, cars,…
Deforestation
Aim: What Do CO2 Emissions Come From?
Aim: What Do CO2 Emissions Come From?
Aim: How Does Each Country Contribute to
Global Warming?
Aim: What is the Greenhouse Effect?
11. What is the Greenhouse effect?
Global Warming or Greenhouse Effect describe the increase in the average
temperature of the biosphere
Aim: What Causes Global Warming?
Humans had first affected global warming some eight thousand years ago with the start of agriculture. Due to
the clearing of the forests for agriculture, the amount of carbon dioxide in the atmosphere increased
drastically.
Since the industrial revolution, humankind also contributes to the increase of carbon dioxide by the burning of
fossil fuels (coal, oil, gas, petrol) to obtain energy. For instance, carbon dioxide is released by power plants,
factories, and cars.
12. Complete the flowing chart bellow about causes of global warming.
Greenhouse gases trap
and retain more heat
Aim: What Causes Global Warming?
Industrial Revolution
Burning Fossil Fuels
(oil, coal, natural gas) by
Agriculture
Deforestation
Burning the forest
Power Plants
Factories
Cars & Central heating & AC
Increase of CO2 levels in atmosphere
Greenhouse gases trap and retain more heat
Aim: What Gases Mainly Cause Global Warming?
13. Which gas is the main contributor to global warming? Carbon Dioxide (CO2)
Aim: What are the Effects of Global Warming?
Aim: What are the Effects of Global Warming?
Aim: What Are the Effects of Global Warming?
Upsala Glacier
Aim: What Are the Effects of Global Warming?
Aim: What are the Effects of Global Warming?
Aim: What are the Effects of Global Warming?
Aim: What are the Effects of Global Warming?
Aim: What Are the Effects of Global Warming?
Aim: What Are the Effects of Global Warming?
Earth’s average temperature is rising.
Change in climate
Melt of the ice caps
Desertification
Droughts
Hurricanes
Tornados
Sea level rises
Floods some coastal areas
Some species will become
endangered or extinct
Some species migrate
to other areas
Loss of
Biodiversity
Aim: How to Solve Global Warming?
1. Reduce the CO2 emission to atmosphere
* Reduce the use of fossil fuels
* Use of clean alternative energy sources
(solar energy)
2. Reforestation: photosynthesis take in CO2
from the atmosphere
1) Based on the figure shown, name one group of organisms that is able to remove
CO2 from the atmosphere.
Land plants, aquatic plants, and algae
2) The reading passage suggests that scientists believe there to be a relationship between an increase in
atmospheric CO2 and global warming.
Using one or more complete sentences, state two specific potential negative effects of such a warming
trend on the living environment of Earth. Be sure to specify how each of the effects you suggest will
have a negative effect on the environment.
Earth’s average temperature is rising.
Change in climate
Melt of the ice caps
Desertification
Droughts
Hurricanes
Tornados
Sea level rises
Floods some coastal areas
Some species will become
endangered or extinct
Some species migrate
to other areas
Loss of
Biodiversity
2) The reading passage suggests that scientists believe there to be a relationship between an increase in
atmospheric CO2 and global warming.
Using one or more complete sentences, state two specific potential negative effects of such a
warming trend on the living environment of Earth. Be sure to specify how each of the effects you
suggest will have a negative effect on the environment.
•Sea level may rise flooding coastal areas and killing many animals, plants,
and humans.
•Climate change: It will become hotter and some organisms will not be able
to live in the increased heat.
•Migration: Some organisms will not be able to live in parts of the world
where they now live due to climate changes or warming.
3. To reduce the amount of carbon dioxide in the atmosphere, it has been suggested that we take the
following two actions:
a) Increase the number of trees through reforestation, OR
b) Protect animals so that their numbers increase.
Using one or more complete sentences:
(a) For each statement, identify whether or not the action will contribute to reducing the CO2 level
of the atmosphere
(b) For each statement, explain why the action will have the effect described in part (a) on the
amount of CO2 in the atmosphere..
(a) Reforestation will reduce atmospheric CO2 because the photosynthesis
that these new trees carry on take in CO2 from the atmosphere.
(b) Animal protection and population increase will not reduce atmospheric CO2
because animals produce CO2 into the atmosphere through respiration.
4. Scientists have discovered a link between deforestation and global warming. Write a paragraph
that explain what is meant by the terms deforestation and global warming, then describe the
connection between the two.
Deforestation is the removal of large numbers of trees from a forested area.
Global warming is the rise in Earth’s average temperature over time. It is caused
by increased carbon dioxide and other gases in the atmosphere.
Deforestation increases global warming since the CO2 stays in the
atmosphere and it is not removed by plants throughout photosynthesis.
Trees can use carbon dioxide during photosynthesis to make carbohydrates. The carbohydrates are used to make new
cells and tissues. These tissues last for the life of the tree, keeping the carbon dioxide “stored” for a long time.
5) Some scientists are urging that immediate action be taken to stop activities that contribute to global
warming.
Discuss the effects of global warming on the environment and describe some human activities that may
contribute to it. Your answer must include:
(1) an explanation of what is meant by the term "global warming"
(2) one human activity that is thought to be a major contributor to global warming and an explanation of how
it may contribute to the problem
(3) one negative effect of global warming if it continues for many years
1) Global warming is the rise in Earth’s average temperature over time.
2) It is caused by increased carbon dioxide and other gases in the
atmosphere due to:
1) burning fossil fuels in power plants, factories and cars.
2) deforestation
(3) Melting of polar ice caps will cause major flooding
• Climate change will cause desertification, droughts
• Climate change will cause some species will become endangered or
extinct