Transcript Global_warming 1x tsang chuk kwan

Global warming is the
increase in the average
temperature of Earth's
near-surface air and
oceans since the mid20th century and its
projected continuation.
1.) Fear of global sea level rise 160 cm
authoritative Arctic Monitoring and Assessment
Programme (AMAP), new research shows the Arctic
ice cap is melting faster than expected, may cause the
average global sea level rise of one hundred and sixty
centimeters, Coastal cities and island nations will have
a devastating impact.
2.) Impairment of climate change range Maize
and Wheat Yield
(AFP, Washington, 6th) - "Science"(Science) published
the latest research report, since 1980, global maize and
wheat yield increase due to climate change were
reduced by 3.8% and 5.5%.
Statistical analysis indicated that, if not global
warming, both the total grain harvest should have a lot
more.
3.) Subtropical rainfall by Antarctic ozone hole
(WASHINGTON) researchers said today that policy
makers and scientists of climate global warming
emissions must be considered something other than
carbon dioxide.Over the past half a century Antarctic
ozone layer is thinning. Scientists in the
"Science"(Science) journal, pointed out that ozone
depletion has given way to the Southern Hemisphere
climate change, it is sub-tropical summer rainfall in dry
areas, 10% more than usual.
4.)Antarctic ice melt halve the number of
penguins and increase the feeding
difficulties
Global warming causing Antarctic penguins
juvenile reduce their staple food difficult, so
the number of adult penguins dropped by more
than 30 years ago, more than half, especially in
the cap with a penguin (Chinstrap penguins)
the most vulnerable.
 5.)Frequency
of extreme weather trend
rise ; worry about typhoon flooding
rainfall and landslide collapse
During the rainy season and typhoon season
approaching, the weather forecast, due to La Nina
weakens, the tropical cyclone hit Hong Kong this year
by last year's 5, to 6-9, while the annual rainfall was
near normal levels, between 2100 To 2700 mm. Lee
Boon Hong Kong Observatory reminds the public
affected by global warming, reduce rainfall days, each
increase in rainfall will cause flooding and landslides
and other disasters, the impact of extreme weather can
not be ignored.
 Burning
of fossil fuels: One of the major reasons of
such a rapid increase is the burning of fossil fuels(including
coal ,oil and natural gas).It is estimated that about 75% of
human-induced carbon dioxide emissions is due to burning
fossil fuels. People have been burning more fossil fuels in
factories and power plants. The increasing use of cars also
emits large amounts of carbon dioxide.
 Deforestation: Deforestation through the burning of tree
is another major reason. The burning process releases
carbon dioxide. This is particularly serious in tropical
rainforest areas. Deforestation also means that fewer trees
are avaible for absorbing the extra amount of carbon dioxide
from the atmosphere.
 Agriculture: Agriculture activities such as rice growing
and cattle rearing produce carbon dioxide , methane and
nitrous oxide .Agriculture activities have increased due to
rapid population growth. This means more crops must be
grown and cattle reared , releasing more carbon dioxide (by
burning organic waste and cattle breathing) and methane(by
cattle during the digestive process and paddy growing)into
the atmosphere.
 Garbage
treatment : People produce enormous amount
of garbage everyday. Most of the garbage into landfills and
incinerators . These garbage treatment activities are sources
of greenhouse gases . When garbage decomposes in the
landfills, methane is released . When burning them in the
incinerators , carbon dioxide and nitrous oxide are emitted
into the atmosphere.
 Industrial
1.
2.
activities : Since the industrial revolution,
manufacturing has become an important human activity.
This activity, however, has produced man-made
greenhouse gases in the atmosphere.
CFCs are man-made chemical components. In the 1980s,
people developed HFCs to replace CFCs to produce foams,
refrigerants and solvents.
Aluminum smelting and magnesium production release
PFCs and SF which are also man-made greenhouse gases.
In addition, the production of nylon release nitrous oxides.
1.) Rising sea levels
As the earth gets warmer, the snow and ice cover
will melt. The thermal expansion of seawater
will lead to a rise in sea level.
2.)Change in climate
-precipitation patterns
-climate regions
-more frequent extreme climate events
3.)Change in world ecosystem
-Desertification
-Extinction of species
-Bleaching of coral
1.) Health risk
Climate change will alter the distribution pattern of parasites,
bacteria and carriers of infectious diseases. Hotter summers
will lead to more cases of heat-related health problems.
2.)Coastal flooding
Bring disaster to billions of people living in coastal areas and
low-lying countries, such as Maldives.
3.)Agriculture and food supply
A warmer Climate would lead to a loss of soil moisture
because of a higher evaporation rate.
4.)Freshwater supply
Higher evaporation rate may lead to shortage of
freshwater supply.
1.) International Cooperation
a.)Signing and ratifying Kyoto Protocol
b.)Adopting the Bail Roadmap
2.)Countries
a.)Reduce greenhouse gas emissions
b.)engaging in a large-scale afforestation
c.)Developing in a sustainable way
3.)Individual effort
Reducing carbon footprint
1.)Meeting the emissions
target incurs extra costs
2.)Different viewpoints of
less developed countries
The end