This PPT is about Global Warming and its Effect. This contains all about natural and human disasters like floods, droughts, and glacier melting. This Ppt has a piece of detailed knowledge about global warming and its effect on our earth and our human lives.
2. CONTENT
Introduction of Global Warming
Causes Of Global Warming
Impacts Of Global Warming
Droughts
Floods
Level Rising Temperature Of Oceans/sea
Tornados
Hurricanes
The Melting Of Mountain Glacier
The Reduction Of Snow Cover
Coastal Erosion
3. INTRODUCTION
Global Warming is the term used to describe a gradual increase
in the average temperature of the Earth’s atmosphere and its
oceans, due to which permanently change occurs in the Earth ‘s
climate.
4. CAUSES OF GLOBAL WARMING
Most of the climate scientists are agree that the main cause of the Global
Warming is due to the “green house effect”.
They may be other cause like
Respiration
Mining activities
Rapid industrialization
Increased in auto mobile use
8. DROUGHTS CAUSED BY
GLOBAL WARMING
A drought is an extended period of dry whether caused by a lack of rain
Increased temperature cause more evaporation
Some places will receive greater concentrations of rain and other places will
receive less(droughts)
9. HOW FLOOD IS CAUSED BY
GLOBAL WARMING
A flood is an overflow of water that submerges land which is usually dry
The rate of evaporation from the ocean seems to be incresing
10. EFFECT OF FLOOD TO IRRIGATION
Embankments of barrages and rivers
Damage underground piping system
Destroy agricultural crops
Affect the water table
Damage Head Canal
Affect Whole Irrigation System
12. RISING TEMPERATURE OF OCEAN&SEA
Rising temperature of ocean and sea may be more significant than the direct
effect of higher temperature.
Because….
The world's agricultural output is heavily dependent on irrigation.
Out of a global cropped area of 1500 million ha, 16% is irrigated.
Global warming is likely to have a major impact on the hydrological cycle and
consequently on irrigated agriculture.
13. RISING TEMPERATURE OF OCEANS & SEA
As we have discussed that atmospheric temp raises due to green house effects so it
raises the temp of sea/ocean on the following two mechanism
Two major mechanisms are causing sea level to rise.
First, shrinking land ice, such as mountain glaciers and polar ice sheets, is releasing
water into the oceans
Second, as ocean temperatures rise, the warmer water expands. Trapped within a
basin bounded by the continents, the water has nowhere to go but up. :
14. RISING TEMPERATURE OF OCEANS & SEA
The consequences of sea level rises due to temp include
Threats to coastal communities
Some 40% of the world’s population lives within 62 miles of the ocean.
16. TORNADOES
Tornadoes:
A tornado is rapidly spinning air that develops from a thunderstorms and is on
the ground.
The ingredients for a tornado are a thunderstorm, winds changing speeds
with height and rapidly rising air.
17. HURRICANES
Hurricanes:
A hurricane is a huge organized thunderstorm complex that develops over the
ocean
The ingredients are warm ocean water, weak upper level winds, and low
pressure
18. IMPACTS OF TORNADOES & HURRICANES
Flooding:
Heavy rains and ocean waters brought ashore by strong winds can caus
e flooding in excess of 50 cm (20 in) over a 24 hour period.
Impacts to Agriculture
As hurricane winds, rainfall, and storm surge cause direct and indirect effects on the
environment, this can also impact agriculture.
Storm Surge:
An abnormal increase in the ocean's level, sometimes in excess of several meters high.
21. MELTING OF GLACIERS
Over a Thousand years ago, Asians used to irrigate their lands by the melted
water from glaciers.
During Warm season, snow melts slowly, releasing a steady flow of water.
Over the last few decades, Glaciers are melting at a torrid pace as an adverse
effect of Global warming & climate change.
22. MELTING OF GLACIERS
Effects of Glacier Melting:
Reduced water for agricultural use
Shrinkage of river based irrigated land
Contamination of coastal groundwater supply
More floods & droughts
Mudslides, dam break etc.