Global WarmingPREETHI P.KURIANSOCIAL SCIENCE

Direction for Computer Assisted lessonFollow the Instruction given below:

This lesson is about the topic- Global Warming.This capsule contain suitable slides related to the concept. Necessary Pictures are provided in each slide. Use mouse (single click) to move to the next slide. Click on the textbox to get the response.Please note the direction given by the computer.Brain Teasers are provided for developing conceptsBrain relaxers are provided for self checking with necessary

explanation.After completing the lesson the learners can recapitulate the

lesson through Test Your knowledge session.

What is Global Warming?

•Global warming is when the earth heats up. •It happens when greenhouse gases (carbon dioxide, water vapor, nitrous oxide, and methane) trap heat and light from the sun in the earth’s atmosphere, which increases the temperature. •This hurts many people, animals, and plants. Many cannot take the change, so they die.

What is global warming ?

Global warming refers to an average increase in the Earth's temperature, which in turn causes

changes in climate.

Global Warming is

Refer Brain Relaxer 2.1

Brain Teaser 2.1Is Global warming is an average increase in the Earth's temperature?

Wrong answer

Correct answer

What causes global warming?

• Many things cause global warming. One thing that causes global warming is electrical pollution. Electricity causes pollution in many ways, some worse than others.

• In most cases, fossil fuels are burned to create electricity. Fossil fuels are made of dead plants and animals. Some examples of fossil fuels are oil and petroleum.

• Many pollutants (chemicals that pollute the air, water, and land) are sent into the air when fossil fuels are burned. Some of these chemicals are called greenhouse gasses.

What are the causes of global warming ?

Man-made causes

Natural causes

The greenhouse effect• The greenhouse

effect is when the temperature rises because the sun’s heat and light is trapped in the earth’s atmosphere. This is like when heat is trapped in a car.

Greenhouse gases• Greenhouse

gases are gases are in the earth’s atmosphere that collects heat and light from the sun.

Greenhouse Gases

Global warming effects

Refer Brain Relaxer 2.2

Brain Teaser 2.2Is global warming adversely affected our environment?

Wrong answer

Correct answer

Effect on Global Warming ?

Earth’s surface to a new high of 14.57 degree centigrade. Rise in temperature was marked by unusually severe weather in many parts of the world. The irony of this global warming is that while it could reduce climatic changes by drying up rains. It could also raise sea levels with disastrous consequences for islands and low- level coastal areas.

i. Serve Changes in Weather :

II.Impact on Arctic Ecosystem :-

The ecosystem which sustains the livelihood of Arctic residents is melting the ice as temperature rise.

The layer of permafrost is melting, causing an inland lake to drain into the ocean and killing fresh water fish.

III.Erratic Rain

People around the world will experience climate changes and the erratic rainfall China to Africa will jeopardize the lives of many people. IT is now nearly a decade since the IPCC accepted that human activates were changing the world’s climate. The most severe warming is seen in the Arctic were the ice pack is shrinking, and thinning, according to the US experts.

IV. More storms, foods, droughts, submergence of

islands :- Scientists have warned that a warmer world will mean more storms, floods, droughts, and snowfalls.

The countries that have to suffer most if the Hague talks fail are the small countries. Islands in danger of being submerged, from the Pacific to the Caribbean are panicky. The lives of million people will be affected by these negotiations.

V. Ozone Getting Depleted

Pollution from transport is the fastest growing source of carbon dioxide emissions since the industrial revolutions Carbon emission levels responsible for 70 percent of global warming vary widely among nations. Due to these emissions the ozone layer that provides a protective shield over the Earth from the harmful ultravoilent radiation is getting depleted. Another greenhouse gas, methane, has more than doubled.RESULT OF THIS, VERY HOT WEATHER LIKE THE SAME IN DESERT REGION OR MORE THAN THAT

VI. Major Climate Change

If we do not act to reduce the emission of these heat- trapping gases, it is predicted that global temperature could rise 2 degree to 6degree Fahrenheit in the next 100 yrs. Just a few degree difference in the global average temperature can mean a major climate change.

The amt o greenhouse gases that are released could be controlled through prudent planning and implementation of environmental priorities. Man has to act now to insure against the risk of destructive future warming by reducing the greenhouse gas emissions.

Resolutions

Kyoto protocol

The Kyoto Protocol is an agreement under which industrialized countries will reduce their collective emissions of greenhouse gases by 5.2% compared to the year 1990

İNDİVİDUAL ACTİONS

Test your knowledge

I Say True or False

1.Global warming is an average increase in the temperature of earth.

2. Greenhouse gases are gases are in the earth’s atmosphere that collects heat and light from the sun.

3. Name the different effects of global warming? …………………………………………………………………………. …Answer……………………………………………………………………….

Conclusion