Global warming becomes a big issue in todays media. If we
read a news paper or watching news on TV you may read or hear about global
warming , What is Global Warming? Global warming is the observed increase in the average temperature of the Earth’s atmosphere and oceans in recent decades
and its projected continuation. The prevailing scientific opinion on climate change
is that “most of the observed increase in globally averaged temperatures
since the mid-20th century is very likely due to the observed
increase in anthropogenic greenhouse gas
concentrations,” which leads to warming of the surface and lower
atmosphere by increasing the greenhouse
effect
. Greenhouse gases are released by activities such as the
burning of fossil fuels, land clearing, and agriculture.
Other phenomena such as solar variation and volcanoes have had smaller
and probably negative effects 1950.

There are lots of myths about the global warming like….

Myth #1: Scientists Agree the Earth is Warming

Facts
about this Myth

It is
true that the measured increase in global average temperature over the last
century was about 1 degree F. But only if manmade greenhouse gas emissions
completely stopped immediately would the temperature increase over the next
century be limited to 1 degree F. Scientists estimate that the average global
temperature increase for the 21st century will be anywhere from 2.5 to 10.4
degrees F, based on the current trends in greenhouse gas output. But even a
rise of 2.5 to 10.4 degrees seems like it would be within tolerable limits,
right? After all, outdoor temperatures swing much more than that from winter to
summer. Second fact is Winters have been getting
warmer? Measurements show that Earths climate has warmed overall over the past
century, in all seasons, and in most regions. The skeptics mislead the public
when they bill the winter of 2003-2004 as record cold in the northeastern
United States. That winter was only the 33rd coldest in the region
since records began in 1896. Furthermore, a single spell of cold weather in one small
region is
no indication of cooling of the global climate,
which refers to a long-termaverage over the entire planet.

Myth #2: Humans Are Causing Global Warming

Facts about this myth.

It is undisputed that humans are entirely responsible for
the increase in

atmospheric CO2 over the past few centuries. In
pre-industrial times, large natural

sources of CO2 were balanced by equally large natural
removal processes, such as

photosynthesis in plants, maintaining a stable level of
CO2 in the atmosphere for

thousands of years. Human-produced emissions, though
smaller than natural

emissions, upset this balance. Because human-produced
emissions arent completely

absorbed by natural processes, they accumulate in the
atmosphere, increasing the

concentration of CO2. There
are natural sources of greenhouse gases. At times during the earth’s history,
natural emissions of greenhouse gases have been critical factors in major
biological calamities on the planet. For instance, during the “Permian
extinction” 250 million years ago, volcanic greenhouse gases played a
primary role in the catastrophic climate change that caused about 80% of the
life on earth to die off. At other times, naturally released greenhouse gases
have also played a role.

Myth #3: The Government Must Act Now to Halt Global Warming

Facts about this Myth .

As we read in above paragraphs that in last 18 years we dint
see any big impact of Human on global warming so most of the Scientist want to
wait for more time. Some scientists followed the common scientific assumption
that a realistic goal of global warming policy would be to stabilize the
concentration of atmospheric CO2 at approximately twice preindustrial
levels, or 550 parts per million by volume. Given that economic growth will
continue with a concomitant rise in greenhouse gas emissions, the scientists
agreed that stabilization at this level is environmentally sound as well as
politically and economically feasible. They also concluded that ,Governments
can cut emissions now to approximately 9 billion tons per year or wait until
2020 and cut emissions by 12 billion tons per year. Either scenario would
result in the desired CO2 concentration of 550 parts per million.
Delaying action until 2020 would yield an insignificant temperature rise of 0.2
degrees Celsius by 2100.

Myth # 4: Human-Caused Global Warming Will Cause Cataclysmic Environmental
Problems

Facts about this Myth.

No doubt in
this myth but human are not causing the global warming as it means there are
lot more natural factors which are causing these problems. Reputable scientists, including those
working on the Intergovernmental Panel on Climate Change (IPCC), the United
Nations organization created to study the causes and effects of global climate
warming, reject these beliefs. The level of sea water is increasing,
many of scientist saying this but most of scientists feels that it is
increasing for thousand of years. Periodic media reports link human-caused
climate changes to more frequent tropical cyclones or more intense hurricanes.
Tropical storms depend on warm ocean surface temperatures (at least 26 degrees
Celsius) and an unlimited supply of moisture. Therefore, they reason, global
warming leads to increased ocean surface temperatures, a greater uptake of
moisture and destructive hurricanes. But recent data shows no increase in the
number or severity of tropical storms, and the latest climate models suggest
earlier models making such connections were simplistic and inaccurate. Since
the 1940s the National Oceanographic and Meteorological Laboratory has
documented a decrease in both the intensity and number of hurricanes. From 1991
through 1995, relatively few hurricanes occurred, even the unusually intense
1995 hurricane season did not reverse the downward trend. The 1996 IPCC report
on climate change found a worldwide significant increase in tropical storms
unlikely; some regions may experience increased activity while others will see
fewer, less severe storms. Since factors other than ocean temperature such as
wind speeds at various altitudes seem to play a larger role than scientists
previously understood, most agree that any regional changes in hurricane
activity will continue to occur against a backdrop of large yearly natural
variations.