save the world: global warming
TRANSCRIPT
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8/14/2019 Save the World: Global Warming
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Global Warming: Problem Identified and Need for
SolutionAnant S Chavan, Dilip K Mhaske
Government Engineering College,
Aurangabad.
Abstract
Heat-trapping pollution is collecting in the atmosphere like a
thickening blanket, trapping the suns heat and causing the planet
to warm up. Burning gasoline, coal, and natural gas produces
these heat-trapping greenhouse gases (GHGs), primarily carbon
dioxide (CO2). As the build-up of GHGs in the atmosphere
continues, global average temperatures continue to rise. The
National Academies of Science in 11 countries, including the
United States, have concluded that human activities are now
causing atmospheric concentrations of greenhouse gasesto rise
well above pre-industrial levels. Carbon dioxide levels have
increased from 280 parts per million (ppm) in 1750 to over 375
ppm todayhigher than any previous levels that can be reliably
measured (i.e., in the last 420,000 years). Increasing greenhouse
gases are causing temperatures to rise; the Earths surface warmed
by approximately 0.6 centigrade degrees (approximately 1F) over
the twentieth century.
KeywordsGHGs, global warming, environ-mental problemsINTRODUCTION
I. Global Warming is a very real phenomenon.
II. Global Warming is a very important topic as our actions
can have a serious impact on the future generations. What we
do today, can lead to a better or worse future for the coming
generations.
III. Global Warming doesnt necessarily mean that the world
gets warmer.
IV. Global Warming is something that is happening every day
and can have a huge impact on future generations and ours.
Global Warming is a major crisis that can have a major impact
on our planet many years to come. Global Warming is a
problem that is going relatively unnoticed. The majority of oursociety regards it as merely an issue that has to be address,
instead of attending to the situation as quickly as possible.
This lack of concern among the general population regarding
their awareness about Global Warming can be blamed on both
media and politicians for not taking an active role in this
problem. By definition, Global Warming is an increase in
Earth's temperature due to an increased use of fossil fuels and
certain industrial wastes and agricultural process leading to a
build-up of "green-house gases" mainly consisting of carbon
dioxide, methane, nitrous oxide, chlorofluorocarbons in the
atmosphere.
In order to meet our daily energy requirements we burn a lot
of fossil fuels like coal or petroleum, which cause a lot of
damage to our environment. We use coal to produce
electricity. We also use petrol or gasoline in our vehicles for
travel. These uses release a lot of carbon dioxide and other
harmful gases in our atmosphere. These activities have
reached such an extent that now it is influencing our climate.
Some of the examples of Global Warming round the globe
include flooding and also shift in major climatic zones and
problems for agricultural productivity. Other examples would
be increased risk to human health, loss of mountain and
coastal-wetland habitats and the plants and animal that live
there, expansion of deserts, disruption of agriculture and
finally a rise in sea level of anywhere from 6 to 37.5 inches
above the current level.
I. PROBLEM
Global warming can lead to increased flooding, sea level rise,more frequent and more serious storms, and dangerous heat
waves, among other threats. Scientific studies have shown that
even with aggressive measures to reduce greenhouse gases,
the earth is committed to at least as much temperature change
in the next 50 to 100 years.
II. THEORETICALDISCUSSION
Global Warming is a big problem and if everyone takes in part
in it we can make a big difference. In fact, as individuals we
can cut back on our daily energy use and conserve energy by
removing items that use unnecessary amounts of energy, buyclean or hybrid vehicles that are environmentally friendly.
Some other things that we can do together would be raise
awareness of the need for action and working to create
Congressional support for ratification of the Kyoto climate
treaty. We also can support stopping of clear-cutting of
valuable forests and help new renewable energy technologies.
As the Earth continues to warm, there is a growing risk that
the climate will change in ways that will seriously disrupt our
lives. If we do not change our lifestyles, we will
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permanently alter Earths ecosystem. While on averagethe globe will get warmer and receive more precipitation,
individual regions will experience different climatic and
environmental impacts.
Because global warming will affect different regions in
different ways, it is important for communities to develop
their own targeted climate adaptation plans. City, county, andstate health departments, along with other local and federal
agencies.
III. GREENHOUSEEFFECT
It is important to understand and discuss the significance of
global warming. Global warming is also known as the
"Greenhouse effect". The "Greenhouse Earth" is surrounded
by a shield of atmospheric gases, rather than a glass or a
plastic cover. The air that makes up our atmosphere consists
primarily of nitrogen and oxygen molecules (N2 at 78% and
O2 at 21%). A large number of "trace gases" make up the
remainder of air's composition. Many of these, includingcarbon dioxide (CO2) and methane (CH4) are the so called
"greenhouse" gases. If you have ever felt the piercing cold of
the clear winter night sky and wondered why you feel warmer
on a cloudy winter night, you have experienced the
atmospheric greenhouse effect firsthand. Physics tell us that
any object warmer than absolute zero will radiate energy.
Cooler objects emit longer waves (in the infrared region)
while hotter ones radiate shorter wavelengths. Our sun,
powered by its hot, nuclear fusion reaction, produces radiant
energy in the visible and ultraviolet regions with relatively
short wavelengths. Of the sunlight that strikes the earth, about
70% is absorbed by the planet and its atmosphere, while the
other 30% is immediately reflected. If the earth did not re-
radiate most of this newly absorbed energy back into space the
world would continue to get warmer. Instead, an energy
balance is maintained.
Fig.Carbon Dioxide traps heat like Greenhouse
The earth is about 60 degrees Fahrenheit (33 degrees Celsius)
warmer than it would be if it did not have the atmospheric
blanket of greenhouse gases and clouds around it. Clouds and
greenhouse gases keep the earth warm. Once warmed, their
molecules then radiate a portion of this heat energy back to
earth, creating more warming on the surface of our planet. It is
this radiation which causes atmospheric gases to move back to
earth that scientists call the "greenhouse effect".
Fig. GHG Emissions By Source in 2004
Carbon dioxide (CO2) gas generated by man's burning of
fossil fuels and the forests is responsible for about half the
greenhouse gas warming. Other gases (CFCs, methane,nitrous oxide, tropospheric ozone) are responsible for the rest.
Increases in all these gases are due to mankind's explosive
population growth over the last century, and increased
industrial expansion. Approximately 80% of atmospheric CO2
increases are due to man's use of fossil fuels: oil, coal, and
gas. These petroleum-based energy sources first came into use
with the burning of coal during Since 1945 petroleum
consumption has increased dramatically, due in large part to
increased usage of automobiles worldwide, and the
substitution of mechanized farm machinery for animal power.
"Mankind is in the process of conducting a major,
unintentional experiment, that of feeding back into the
atmosphere in a short space of geological time the fossils fuelsthat have slowly accumulated over the past 500 million
years."
IV. THEEARTHHEATINGUP
Much debate in the last five years about the greenhouse
effect has cantered on interpreting temperature numbers
generated at weather stations all over the world. The data from
these thermometers are averaged and plotted in attempts to
determine just how fast the earth has heated up since the
measurements began. There is now no doubt the world is
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getting warmer. The thermometers show that the world is
warmer now than at any time since the measurements started.
The year 1990 was the hottest year in the last century.
Together with 1991, the years of 1983, 1987, 1988, and 1989,
have been measured to be the warmest 6 years in the last
hundred years. 1991 was the second warmest year of the past
century, perhaps due to the eruption of Mt. Pinatubo during
that year. The ash from the volcano in the upper atmosphere
blocks some sunlight to earth, and is expected to generate a
temporary two or three year cooling effect. After that time,
most ash particles will have settled back to earth, and most
scientists expect to see the global warming trend continue.
V. CURRENTEFFECTS
A. Global warming has great effect on crops and weather
conditions around the world. The northern hemisphere
contains more land area than the southern hemisphere, and
conversely, a lower percentage of the world's oceans. Since
oceans absorb more heat than land areas, it is not surprising
that most climate models predict faster heating over the
northern hemisphere than the global average. In addition,
models predict faster temperature increases at higher latitudes.
If global warming trends continue, high temperatures
everywhere in the US may reduce US agricultural
productivity. Northern continental areas are projected to have
drier summer soils, due in part to earlier snow melts in the
spring, and hotter, more cloudless summers, causing extensive
evaporation of ground moisture.
B. Due to global warming concern is the possible rise of sea
levels. With a large number of the world's cities in coastal
areas, this is a significant problem. There are two majorcauses of rising sea levels. First, extra water is produced when
ice melts. Secondly, the natural expansion of sea water as it
becomes warmer. The range of sea ice around both poles
continues to shrink, as it melts. Even with the level of
greenhouse gases present today, the earth may warm enough
in the next 50 years or so to completely melt the sea ice
located on the poles
VI. REALCAUSES
A. Forest destruction creates more heat:
Trees are able to store a large amount of CO2 in their
structures. An acre of forest will absorb about 10 times the
CO2 amount absorbed by an acre of crop land or grassland.
One tree absorbs about 13 pounds of CO2 per year, and each
one acre of forest absorbs about 2.8 tons of CO2. However,
when trees are burned, the carbon locked in the structure isreleased into the air in the form of CO2. Today, the shrinking
world forests are not able to absorb all the CO2 created by
human beings while burning fossil fuels. Everyday over 5500
acres of rain forest are destroyed, and over 50 million acres
are destroyed every year. Global CO2 levels rise
approximately 0.4 percent each year, to levels not experienced
on this planet for millions of years. Planting more trees and
reducing timber cuts world-wide will help restore the
imbalance, and perhaps buy time as ways are found to reduce
world greenhouse gas emissions.
Fig. Causes of global warming
B. Population growth contributes to global warming.
The intellectual powers that we enjoy has enabled us to make
effective use of technology and thereby changed the
environment. Technology is partly responsible for explosive
population growth and responsible for the resulting damage to
Earth's resources. The industrial revolution caused a rapid
increase in the Population growth, as oil and gas fuels were
exploited for our use. There is a clear link between the
problems of global warming and overpopulation, as increases
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in CO2 levels follows growth in population. Presently, we
have too many people on Earth, who are using technologies
that are destructive for the Earth. We cannot continue to grow,
and make use of limited natural resources.
VII. SOLUTIONS
A. Technical Solutions
Renewable Energy
Renewable energy resources, such as wind and solar, offer
abundant opportunities to generate clean electricity. Currently,
renewable energy supplies about 11% of the states electricity
needs. Each year, renewable power reduces state-wide NOx
emissions by almost 3,400 tons, avoiding emissions equal to
more than 350,000 cars.
Cleaner Cars
Cars and trucks are the largest source of global warming
pollution in the world, and also offer the greatest opportunities
to cut the worlds pollution. Passenger vehicles should be
subject to tailpipe emission standards, which provide
significant air pollution reductions. Even so, strategies to cut
global warming pollution from vehicles will further reduce air
pollution.
Alternative Fuels
Alternative fuel vehicles can also provide reductions in air
pollution. In particular, electric and hydrogen powered
vehicles do not have any tailpipe emissions, and if their fuel is
produced from clean energy sources, then they can be
powered without producing global warming pollution or airpollution. Renewable fuels such as ethanol and biodiesel can
also reduce global warming pollution. High blend ethanol (E-
85) can avoid the air quality problems associated with low
blends and maximize global warming pollution reductions.
Diesel Emission Reduction Strategies
Reducing diesel emissions can provide multiple benefits
reducing global warming pollution, air toxics, and smog-
forming pollutants. In particular, reducing emissions of diesel
particulate matter (PM) can provide significant health
benefits, because diesel PM is responsible for 70% of the
cancer risk associated with air toxics.
Transit systems reduce pollution while providing a convenient
alternative for commuters. Public transit generally requires
only half the energy of cars and SUVs for every passenger
mile travelled.
B. What we can do to decrease global warming:
There are several things which you can do directly after
reading this paper.
1. Replace a regular incandescent light bulb with a
compact fluorescent light bulb (cfl)
2. Clean or replace filters on your furnace and air
conditioner
3. Choose energy efficient appliances when making
new purchases
4. Defrost old fridges and freezers regularly
5. Wrap your water heater in an insulation blanket
6. Don't let heat escape from your house over a long
period
7. Recycle your organic waste and Be sure youre
recycling at home
8. Switch to green power, Do not leave appliances on
standby
9. Reduce the number of miles you drive by walking,
biking, carpooling or taking mass transit wherever
possible and Fly less
10. Encourage your school or business to reduce
emissions, encourage the switch to renewable energy
11. Protect and conserve forest worldwide
12. Make your city cool,
13. Try telecommuting from home
14. Drive carefully and do not waste fuel, Check your
tires weekly to make sure theyre properly inflated,
When it is time for a new car, choose a more fuel
efficient vehicle.
15. Reuse your shopping bag
16. Plant a Tree, and be sure it is growing properly.
VIII. CONCLUSIONS
A. Global Warming is real.
B. It is a serious problem that has to be addressed.
C. Education of the mainstream society regarding the
consequences of global warming is the first step in curbing the
problem
D. There are solutions that can help reduce Global Warming,
and we can be a part of it.
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