TOPIC:GLOBAL WARMING

SUBJECT: BIOLOGY

DATE : 10-03-10

CLASS: KAPPA-2

PRESENTED BY:T.PURUSHOTHAM

GLOBAL WARMING

IT IS ONE OF THE WORLD'S BIGGEST PROBLEMS FACED BY MANKIND TODAY

We need to understand

What is global warming?

What are the causes for this global warming?

What are the harmful effects of this on our mother earth?

How can we prevent global warming?

What are the steps taken by the government in this aspect?

What we students can do to prevent such a big global problem?

Global warming

Global warming is the increase in the average temperature of Earth's near-surface, air and oceans since the mid-20th century and its projected continuation.

Global surface temperature increased 0.74 0.18 C (1.33 0.32 F) between the start and the end of the 20th century.

The main cause for the global warming are green house gases like water vapor, carbon dioxide, ozone and methane which are responsible for
GREEN HOUSE EFFECT

EMISSION OF CO2 INTO ATMOSPHERE

POLAR ICE CAPS MELTING

MELTING GLACIERS IN HIMALAYAS

DISGUSTING EFFECTS

An increase in global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, probably including expansion of subtropical deserts.

Warming is expected to be strongest in the Arctic and would be associated with continuing retreat of glaciers, permafrost and sea ice.

EFFECTS

Other likely effects include changes in the frequency and intensity of extreme weather events, species extinctions, and changes in agricultural yields.

Warming and related changes will vary from region to region around the globe, though the nature of these regional variations are uncertain.

Greenland is now losing 20 percent more mass than it receives from new snowfall each year.

Greenland Ice Sheet

Disintegration of the Larsen B Ice Shelf, Antarctic Peninsula

The ice shelf disintegrated suddenly in March 2002 due to warm summer temperatures

NASA Earth Observatory

The February 9, 2007 image shows the area previously occupied by Larsen B ice shelf seen as semi-circular area at the right side of the image. The resulting icebergs from the disintegration flowed to the Weddell sea. These icebergs wouldnt have raised the sea level since the ice shelf was already floating in water and occupied as much volume as the water that would have been generated when it melted. However, these ice shelves act as brakes to the glaciers flowing out to the sea. So the loss of these shelves can speed up the flow of glaciers to the sea, which can result in the rise of sea level.

North America: Angangueo

1986: Images show Degradation of forest area

2001: Between 1984 and 1999, 38 per cent of forests were degraded

Hubbard Glacier advances United States

14 Aug 200210 Aug 2002

These photographs show an enlarged eastward-looking view of a small section of the Hubbard Glacier terminus and the evolution of the squeeze-push moraine in front of Gilbert Point that blocked the tidal exchange between Disenchantment Bay (bottom of photos) and Russell Fiord (top of photos), creating Russell Lake which rose to 18.6 metres (61 feet) above sea level over 212 months before it finally outburst on 14 August 2002, creating the second largest glacial lake outburst worldwide in historical times.

North America: Angangueo

1986: Images show Degradation of forest area

2001: Between 1984 and 1999, 38 per cent of forests were degraded

Glacier National Park, Montana, United States

The response to climate change is being observed with the receding glaciers.

Retreat of San Quintin Glacier, ChileNASA Earth Observatory The San Quintin Glacier appears to be losing mass and retreating

The San Quintn Glacier is the largest outflow glacier of the Northern Patagonian Ice Field located in southern region of Chile. As seen in the photographs, this glacier appears to be retreating and losing mass in recent years.

Preventive measures

Avoid Deforestration

DON'T DO THIS

Follow these !

Decrease the use of fossil fuels

Use of eco-friendly resources like solar energy

Reduce pollution

Reduce use of firewood

Reduce the wastage of power and save our mother earth

What is the role of the government to prevent
global warming

Political and public debate continues regarding global warming, and what actions to take in response.

The available options are mitigation to reduce further emissions; adaptation to reduce the damage caused by warming; and, more speculatively, geoengineering to reverse global warming.

Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions.

Think ....what we can do to prevent
global warming?

?...

Can we do these?

Plant trees in our surrounding areas

Use power efficiently

Switch off all fans & lights while leaving the class rooms and dormitories

Switch off the laptops when you are away from them even for short duration

Use eco-friendly resources

Try to bring awareness about global problems like pollution and global warming among people

THINK GLOBALLY ,ACT LOCALLY.....

Thank You!

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