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Thursday 15 March 2012

Global Warming

Global Warming


Throughout its long history, Earth has warmed and cooled time and again.  Climate has changed when the planet received more or less sunlight due to subtle shifts in its orbit, as the atmosphere or surface changed, or when the Sun’s energy varied. But in the past century, another force has started to influence Earth’s climate: humanity.
How does this warming compare to previous changes in Earth’s climate? How can we be certain that human-released greenhouse gases are causing the warming? How much more will the Earth warm? How will Earth respond? Answering these questions is perhaps the most significant scientific challenge of our time.

What is Global Warming?

Global warming is the unusually rapid increase in Earth’s average surface temperature over the past century primarily due to the greenhouse gases released as people burn fossil fuels. The global average surface temperature rose 0.6 to 0.9 degrees Celsius (1.1 to 1.6° F) between 1906 and 2005, and the rate of temperature increase has nearly doubled in the last 50 years. Temperatures are certain to go up further.

Earth’s natural greenhouse effect

Earth’s temperature begins with the Sun. Roughly 30 percent of incoming sunlight is reflected back into space by bright surfaces like clouds and ice. Of the remaining 70 percent, most is absorbed by the land and ocean, and the rest is absorbed by the atmosphere. The absorbed solar energy heats our planet.
As the rocks, the air, and the seas warm, they radiate “heat” energy (thermal infrared radiation). From the surface, this energy travels into the atmosphere where much of it is absorbed by water vapor and long-lived greenhouse gases such as carbon dioxide and methane.
When they absorb the energy radiating from Earth’s surface, microscopic water or greenhouse gas molecules turn into tiny heaters— like the bricks in a fireplace, they radiate heat even after the fire goes out. They radiate in all directions. The energy that radiates back toward Earth heats both the lower atmosphere and the surface, enhancing the heating they get from direct sunlight.
This absorption and radiation of heat by the atmosphere—the natural greenhouse effect—is beneficial for life on Earth. If there were no greenhouse effect, the Earth’s average surface temperature would be a very chilly -18°C (0°F) instead of the comfortable 15°C (59°F) that it is today.

The enhanced greenhouse effect

What has scientists concerned now is that over the past 250 years, humans have been artificially raising the concentration of greenhouse gases in the atmosphere at an ever-increasing rate, mostly by burning fossil fuels, but also from cutting down carbon-absorbing forests. Since the Industrial Revolution began in about 1750, carbon dioxide levels have increased nearly 38 percent as of 2009 and methane levels have increased 148 percent.
Ways to Stop Global Warming: 
  • People should reduce the usage of electrical appliances which emits green house gases. For e.g. the refrigerator releases chlorofluro carbon (CFC) and the incandescent light lamp emits 300 pounds of carbon dioxide a year. This can be replaced by a compact fluorescent light bulb which saves much energy.
  • Follow RRR - Reduce, Reuse, Recycle. People should not dump waste products on the ground. Plant products, food waste, vegetable dump undergoes anaerobic decomposition i.e. they break down to produce methane, a green house gas instead of oxygen. Hence the product usage and wastage should be reduced or recycled for a healthy atmosphere.
  • Trees absorb a large amount of carbon dioxide. Many trees should be planted since they involve in photosynthesis, food preparation with the help of sunlight. During this process, trees absorb carbon dioxide and exhale oxygen. Also, existing forests should be saved and usage of plant byproducts shouldn not be wasted.
  • Usage of green power prevents 300 kg of carbon dioxide to be emitted into the atmosphere. The electricity obtained from the renewable resources like wind and water is called green power. The cost is also low in case of green power.




Corruption


CORRUPTION
In philosophicaltheological, or moral discussions, corruption is spiritual or moral impurity or deviation from an ideal. In economy, corruption is payment for services or material which the recipient is not due, under law. This may be called briberykickback, or, in the Middle East,baksheesh. In government it is when an elected representative makes decisions that are influenced by campaign contributions rather than their own personal beliefs. In government, when an elected representative makes decisions based on creating jobs or distributing money which raises support/votes in their district using tax money raised in someone else's district.
                                                                       Politics
Political corruption is the abuse of public power, office, or resources by elected government officials for personal gain, e.g. by extortion, soliciting or offering bribes. It can also take the form of office holders maintaining themselves in office by purchasing votes by enacting laws which use taxpayer money. Systemic corruption, the complete subversion of a political or economic system. Governmental corruption of judiciary is broadly known in many transitional and developing countries because the budget is almost completely controlled by the executive. The latter undermines the separation of powers, as it creates a critical financial dependence of the judiciary. The proper national wealth distribution including the government spending on the judiciary is subject of the constitutional economics.
                                                                        Police 
Police corruption is a specific form of police misconduct designed to obtain financial benefits, other personal gain, and/or career advancement for a police officer or officers in exchange for not pursuing, or selectively pursuing, an investigation or arrest. One common form of police corruption is soliciting and/or accepting bribes in exchange for not reporting organized drug or prostitution rings or other illegal activities. Another example is police officers flouting the police code of conduct in order to secure convictions of suspects — for example, through the use of falsified evidence. More rarely, police officers may deliberately and systematically participate in organized crime themselves. In most major cities, there are internal affairs sections to investigate suspected police corruption or misconduct. 
                                                        How You Can Support
Everyone can make an impact on curbing corruption .
• By becoming actively involved
• By contributing his or her time
• By suggesting changes to improve the system