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