| Global warming becomes a big issue in today's | | | | catastrophic climate change that caused about |
| media. If we read a news paper or watching | | | | 80% of the life on earth to die off. At other |
| news on TV you may read or hear about global | | | | times, naturally released greenhouse gases |
| warming , What is Global Warming? Global | | | | have also played a role. |
| warming is the observed increase in the | | | | |
| average temperature of the Earth's atmosphere | | | | Myth #3: The Government Must Act Now to Halt |
| and oceans in recent decades and its | | | | Global Warming |
| projected continuation. The prevailing | | | | |
| scientific opinion on climate change is that | | | | Facts about this Myth . |
| "most of the observed increase in globally | | | | |
| averaged temperatures since the mid-20th | | | | As we read in above paragraphs that in last |
| century is very likely due to the observed | | | | 18 years we dint see any big impact of Human |
| increase in anthropogenic greenhouse gas | | | | on global warming so most of the Scientist |
| concentrations," which leads to warming of | | | | want to wait for more time. Some scientists |
| the surface and lower atmosphere by | | | | followed the common scientific assumption |
| increasing the greenhouse effect. Greenhouse | | | | that a realistic goal of global warming |
| gases are released by activities such as the | | | | policy would be to stabilize the |
| burning of fossil fuels, land clearing, and | | | | concentration of atmospheric CO2 at |
| agriculture. Other phenomena such as solar | | | | approximately twice preindustrial levels, or |
| variation and volcanoes have had smaller and | | | | 550 parts per million by volume. Given that |
| probably negative effects 1950. There are | | | | economic growth will continue with a |
| lots of myths about the global warming | | | | concomitant rise in greenhouse gas emissions, |
| like.... | | | | the scientists agreed that stabilization at |
| | | | this level is environmentally sound as well |
| Myth #1: Scientists Agree the Earth is | | | | as politically and economically feasible. |
| Warming | | | | They also concluded that ,Governments can cut |
| | | | emissions now to approximately 9 billion tons |
| Facts about this Myth | | | | per year or wait until 2020 and cut emissions |
| | | | by 12 billion tons per year. Either scenario |
| It is true that the measured increase in | | | | would result in the desired CO2 concentration |
| global average temperature over the last | | | | of 550 parts per million. Delaying action |
| century was about 1 degree F. But only if | | | | until 2020 would yield an insignificant |
| manmade greenhouse gas emissions completely | | | | temperature rise of 0.2 degrees Celsius by |
| stopped immediately would the temperature | | | | 2100. |
| increase over the next century be limited to | | | | |
| 1 degree F. Scientists estimate that the | | | | Myth # 4: Human-Caused Global Warming Will |
| average global temperature increase for the | | | | Cause Cataclysmic Environmental Problems |
| 21st century will be anywhere from 2.5 to | | | | |
| 10.4 degrees F, based on the current trends | | | | Facts about this Myth. No doubt in this myth |
| in greenhouse gas output. But even a rise of | | | | but human are not causing the global warming |
| 2.5 to 10.4 degrees seems like it would be | | | | as it means there are lot more natural |
| within tolerable limits, right? After all, | | | | factors which are causing these problems. |
| outdoor temperatures swing much more than | | | | Reputable scientists, including those working |
| that from winter to summer. Second fact is | | | | on the Intergovernmental Panel on Climate |
| Winters have been getting warmer? | | | | Change (IPCC), the United Nations |
| Measurements show that Earth's climate has | | | | organization created to study the causes and |
| warmed overall over the past century, in all | | | | effects of global climate warming, reject |
| seasons, and in most regions. The skeptics | | | | these beliefs. The level of sea water is |
| mislead the public when they bill the winter | | | | increasing, many of scientist saying this but |
| of 2003-2004 as record cold in the | | | | most of scientists feels that it is |
| northeastern United States. That winter was | | | | increasing for thousand of years. Periodic |
| only the 33rd coldest in the region since | | | | media reports link human-caused climate |
| records began in 1896. Furthermore, a single | | | | changes to more frequent tropical cyclones or |
| spell of cold weather in one small region is | | | | more intense hurricanes. Tropical storms |
| no indication of cooling of the global | | | | depend on warm ocean surface temperatures (at |
| climate, which refers to a long-termaverage | | | | least 26 degrees Celsius) and an unlimited |
| over the entire planet. | | | | supply of moisture. Therefore, they reason, |
| | | | global warming leads to increased ocean |
| Myth #2: Humans Are Causing Global Warming | | | | surface temperatures, a greater uptake of |
| | | | moisture and destructive hurricanes. But |
| Facts about this myth. | | | | recent data shows no increase in the number |
| | | | or severity of tropical storms, and the |
| It is undisputed that humans are entirely | | | | latest climate models suggest earlier models |
| responsible for the increase inatmospheric | | | | making such connections were simplistic and |
| CO2 over the past few centuries. In | | | | inaccurate. Since the 1940s the National |
| pre-industrial times, large naturalsources of | | | | Oceanographic and Meteorological Laboratory |
| CO2 were balanced by equally large natural | | | | has documented a decrease in both the |
| removal processes, such asphotosynthesis in | | | | intensity and number of hurricanes. From 1991 |
| plants, maintaining a stable level of CO2 in | | | | through 1995, relatively few hurricanes |
| the atmosphere forthousands of years. | | | | occurred, even the unusually intense 1995 |
| Human-produced emissions, though smaller than | | | | hurricane season did not reverse the downward |
| naturalemissions, upset this balance. Because | | | | trend. The 1996 IPCC report on climate change |
| human-produced emissions aren't | | | | found a worldwide significant increase in |
| completelyabsorbed by natural processes, they | | | | tropical storms unlikely; some regions may |
| accumulate in the atmosphere, increasing | | | | experience increased activity while others |
| theconcentration of CO2. There are natural | | | | will see fewer, less severe storms. Since |
| sources of greenhouse gases. At times during | | | | factors other than ocean temperature such as |
| the earth's history, natural emissions of | | | | wind speeds at various altitudes seem to play |
| greenhouse gases have been critical factors | | | | a larger role than scientists previously |
| in major biological calamities on the planet. | | | | understood, most agree that any regional |
| For instance, during the "Permian extinction" | | | | changes in hurricane activity will continue |
| 250 million years ago, volcanic greenhouse | | | | to occur against a backdrop of large yearly |
| gases played a primary role in the | | | | natural variations. |