BARACK OBAMA

Mini Biography

Barack Obama was born to a white American mother, Ann Dunham, and a black Kenyan father, Barack Obama, Sr., who were both young college students at the University of Hawaii. When his father left for Harvard, she and Barack stayed behind, and his father ultimately returned alone to Kenya, where he worked as a government economist. Barack's mother remarried an Indonesian oil manager and moved to Jakarta when Barack was six. He later recounted Indonesia as simultaneously lush and a harrowing exposure to tropical poverty. He returned to Hawaii, where he was brought up largely by his grandparents. The family lived in a small apartment - his grandfather was a furniture salesman and an unsuccessful insurance agent and his grandmother worked in a bank - but Barack managed to get into Punahou School, Hawaii's top prep academy. His father wrote to him regularly but, though he traveled around the world on official business for Kenya, he visited only once, when Barack was ten.

Obama attended Columbia University, but found New York's racial tension inescapable. He became a community organizer for a small Chicago church-based group for three years, helping poor South Side residents cope with a wave of plant closings. He then attended Harvard Law School, and in 1990 became the first African-American editor of the Harvard Law Review. He turned down a prestigious judicial clerkship, choosing instead to practice civil-rights law back in Chicago, representing victims of housing and employment discrimination and working on voting-rights legislation. He also began teaching at the University of Chicago Law School. Eventually he ran as a Democrat for the state senate seat from his district, which included both Hyde Park and some of the poorest ghettos on the South Side, and won.

In 2004 Obama was elected to the U.S. Senate as a Democrat, representing Illinois, and gained national attention by giving a rousing and well-received keynote speech at the Democratic National Convention in Boston. In 2008 he ran for president as a democrat and won. He is set to become the 44th president of the Unites States and the first African-American ever elected to that position.

IMDb Mini Biography By: A. Nonymous and DarthBotto

Spouse

Michelle Obama

(3 October 1992 - present) 2 children

Trivia

His first name comes from the word that means "blessed by God" in Arabic.

In the Kenyan town where his father was born, the long-brewed "Senator" brand of beer has been nicknamed "Obama."

U.S. Senator from Illinois since 3 January 2005.

Won a Grammy for Best Spoken Word for the CD version of his autobiography "Dreams From My Father" (2006).

Lives in Hyde Park (Chicago).

On "Late Night with Conan O'Brien" (1993), he revealed that President George W. Bush nicknamed him "Bama" and "Rock".

The movie he saw on his first date with Michelle Obama was Do the Right Thing (1989).

Related to Park Overall.

Has two daughters, Malia Obama (born in 1998) and Sasha Obama (born in 2001).

Candidate for the Democratic nomination in the 2008 US presidential election.

Several celebrities including; Halle Berry, George Clooney, Sheryl Crow, Bob Dylan, Topher Grace, Macy Gray, Bruce Springsteen, Oprah Winfrey Tom Hanks, Scarlett Johansson, Hayden Panettiere, Zachary Quinto, Eddie Murphy and John Cleese support his 2008 presidential campaign. Robert De Niro gave his endorsement at the same rally where Barack was endorsed by Caroline and Ted Kennedy.

Enjoys playing basketball and poker.

At his wife's suggestion, he quit smoking before his campaign to win the Democratic nomination began.

His paternal relatives still live in Kenya.

Confessed teenage drug experiences in his memoirs "Dreams from My Father".

One of his ancestors was Mareen Duvall, also an ancestor of actor Robert Duvall.

Shares his surname with a small city in western Japan, which means "small shore" in Japanese.

Plays basketball.

Born to Barack Hussein Obama, Sr. (1936-1982) and Ann Dunham (1942-1995), married from 1960 to 1965.

Named one of Time magazine's "100 most influential people in the world" list in 2005 and 2007.

Chosen as one of "10 people would change the world" by New Statesman magazine (2005).

Won his second Grammy Award for Best Spoken Word Album for "The Audacity of Hope" (2008).

On June 3, 2008 he won the Montana primary election giving him enough delegates to become the first Black American presidential candidate to win a major political party's presumptive nomination for the office of President of the United States.

Is a die-hard Chicago White Sox fan.

More than 215,000 people attended his speech in Berlin on 24 July 2008.

Has one half-sister, Maya, born to his mother and stepfather in 1970.

Has his look-alike puppet in the French show "Guignols de l'info, Les" (1988).

Barack Obama's grandmother, Madelyn Payne Dunham died Sunday November 2, 2008 in the early evening in Honolulu from cancer. She was 86.

Is the first African-American man to be elected President of the United States (November 2008).

When elected President, he won the battleground states of Florida, Virginia and Colorado - all of which had voted Republican in 2004.

Is the first American president to be born in Hawaii.

Was the 27th lawyer to be elected American president.

Was elected to be the 44th president of the Unites States of America on 4 November, 2008.

As a child growing up in Hawaii, his classmates knew him as Barry.

Presidential campaign slogan: "Change we can believe in".

Is primarily of Kenyan, Irish, and English ancestry.

Personal Quotes

(from DNC keynote speech) "There's not a liberal America and a conservative America. There's the United States of America. We worship an awesome God in the blue states, and we don't like federal agents poking around our libraries in the red states. We coach Little League in the blue states, and have gay friends in the red states. There are patriots who opposed the war, and patriots who supported it. We are one people, all of us pledging allegiance to the Stars and Stripes, all of us defending the United States of America."

And it lives on in those Americans -- young and old, rich and poor, black and white, Latino and Asian and Native American, gay and straight -- who are tired of a politics that divides us and want to recapture the sense of common purpose that we had when John Kennedy was President of the United States of America.

Sometimes I don't know who I'm running against. (about Bill Clinton's support for Hillary Clinton)

[When asked whether he would call on the Clintons to release their tax returns, after Hilary loaned $5 million of her own money to her campaign] I'll just say that I've released my tax returns. That's been a policy I've maintained consistently. I think the American people deserve to know where you get your income from. But I'll leave it up to you guys to chase it down... I think we set the bar in terms of transparency and disclosure that has been a consistent theme of my campaign and my career in politics.

In the unlikely story that is America, there has never been anything false about hope.

When I am this party's nominee, my opponent will not be able to say that I voted for the war in Iraq; or that I gave George Bush the benefit of the doubt on Iran; or that I supported Bush-Cheney policies of not talking to leaders that we don't like. And he will not be able to say that I wavered on something as fundamental as whether or not it is ok for America to torture - because it is never ok. That's why I am in it. As President, I will end the war in Iraq. We will have our troops home in sixteen months. I will close Guantanamo. I will restore habeas corpus. I will finish the fight against Al Qaeda. And I will lead the world to combat the common threats of the 21st century - nuclear weapons and terrorism; climate change and poverty; genocide and disease. And I will send once more a message to those yearning faces beyond our shores that says, "You matter to us. Your future is our future. And our moment is now."

This time we want to talk about the crumbling schools that are stealing the future of black children and white children and Asian children and Hispanic children and Native American children. This time we want to reject the cynicism that tells us that these kids can't learn; that those kids who don't look like us are somebody else's problem. The children of America are not those kids, they are our kids, and we will not let them fall behind in a 21st century economy. Not this time.

Sniper Rifle

Sniper rifle
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The 7.62x51mm M40, United States Marine Corps standard-issue sniper rifle.
The Accuracy International Arctic Warfare series of sniper rifles is standard issue in the armies of many countries, including those of Britain and Germany (picture shows a rifle of the German Army).
"Alex" - the new 7.62x51mm Polish bolt-action sniper rifle.

In military and law enforcement terminology, a sniper rifle is a rifle used to ensure accurate placement of bullets at longer ranges than small arms. A typical sniper rifle is built for optimal levels of accuracy, fitted with a telescopic sight and chambered for a military centerfire cartridge. The term is often used in the media to describe any type of accurized firearm fitted with a telescopic sight that is employed against human targets.

The military role of sniper (a term derived from the snipe, a bird which was difficult to hunt and shoot) dates back to the turn of the 18th century, but the sniper rifle itself is a much more recent development. Advances in technology, specifically that of telescopic sights and more accurate manufacturing, allowed armies to equip specially-trained soldiers with rifles that would enable them to deliver precise shots over greater distances than regular infantry weapons. The rifle itself could be a standard rifle (at first, a bolt-action rifle); however, when fitted with a telescopic sight, it would become a sniper rifle.

History

During World War II, the (7.62x54mmR) Mosin-Nagant rifle mounted with a telescopic sight was commonly used as a sniper rifle by Russian snipers.

In the American Civil War, Confederate troops equipped with barrel-length three power scopes mounted on the then-premium British Whitworth rifle had been known to kill Union officers at ranges bordering 800 yards, an unheard-of distance at that time.[1][2][3][4]

The earliest sniper rifles were little more than conventional military or target rifles with long-range "peep sights" and Galilean 'open telescope' front and rearsights, designed for use on the target range. Only from the beginning of World War I did specially adapted sniper rifles come to the fore. Germany deployed military calibre hunting rifles with telescopic sights which was countered by the British with Aldis, Winchester and Periscopic Prism Co. sights fitted by gunsmiths, to regulation SMLE Mk III and Mk III* rifles. Australia's No.1 Mk III* (HT) rifle was another later conversion of the SMLE fitted with the Lithgow heavy target barrel at the end of WW2.

Typical World War II-era sniper rifles were generally standard issue battle rifles, hand-picked for accuracy, with a 2.5x or 3x telescopic sight and cheek-rest fitted, with the bolt turned down if necessary to allow operation with the scope affixed. By the end of the war, forces on all sides had specially trained soldiers equipped with sniper rifles, and they have played an increasingly important role in military operations ever since.

TERRORIST

Terrorism

The examples and perspective in this article may not represent a worldwide view of the subject. Please improve this article or discuss the issue on the talk page.

Terrorism, according to the Oxford English Dictionary is "A policy intended to strike with terror those against whom it is adopted; the employment of methods of intimidation; the fact of terrorizing or condition of being terrorized."[1] At present, there is no internationally agreed upon definition of terrorism.[2][3] Common definitions of terrorism refer only to those acts which (1) are intended to create fear (terror), (2) are perpetrated for an ideological goal (as opposed to a materialistic goal or a lone attack), and (3) deliberately target (or disregard the safety of) non-combatants. Some definitions also include acts of unlawful violence or unconventional warfare.

A person who practices terrorism is a terrorist. Acts of terrorism are criminal acts according to United Nations Security Council Resolution 1373 and the domestic jurisprudence of almost all nations.

The word “terrorism” is politically and emotionally charged,[4] and this greatly compounds the difficulty of providing a precise definition. A 1988 study by the United States Army found that over 100 definitions of the word “terrorism” have been used.[5] The concept of terrorism is itself controversial because it is often used by states to delegitimize political or foreign opponents, and potentially legitimize the state's own use of terror against them.

The history of terrorist organizations suggests that they do not practice terrorism only for its political effectiveness; individual terrorists are also motivated by a desire for social solidarity with other members.[6]

Terrorism has been practiced by a broad array of political organizations for furthering their objectives. It has been practiced by both right-wing and left-wing political parties, nationalistic groups, religious groups, revolutionaries, and ruling governments.

Origin of term
Main article: Definition of terrorism
See also: State terrorism

"Terror" comes from a Latin word meaning "to frighten". The terror cimbricus was a panic and state of emergency in Rome in response to the approach of warriors of the Cimbri tribe in 105BC. The Jacobins cited this precedent when imposing a Reign of Terror during the French Revolution. After the Jacobins lost power, the word "terrorist" became a term of abuse. Although the Reign of Terror was imposed by a government, in modern times "terrorism" usually refers to the killing of innocent people by a private group in such a way as to create a media spectacle. This meaning can be traced back to Sergey Nechayev, who described himself as a "terrorist".[8] Nechayev founded the Russian terrorist group "People's Retribution" (Народная расправа) in 1869.

In November 2004, a United Nations Security Council report described terrorism as any act "intended to cause death or serious bodily harm to civilians or non-combatants with the purpose of intimidating a population or compelling a government or an international organization to do or abstain from doing any act". (Note that this report does not constitute international law).[9]

In many countries, acts of terrorism are legally distinguished from criminal acts done for other purposes, and "terrorism" is defined by statute; see definition of terrorism for particular definitions. Common principles among legal definitions of terrorism provide an emerging consensus as to meaning and also foster cooperation between law enforcement personnel in different countries. Among these definitions there are several that do not recognize the possibility of legitimate use of violence by civilians against an invader in an occupied country and would, thus label all resistance movements as terrorist groups. Others make a distinction between lawful and unlawful use of violence. Ultimately, the distinction is a political judgment.[10]

INTERNET

Internet
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For other uses, see Internet (disambiguation).
Semi-protected
It has been suggested that Internet capitalization conventions be merged into this article or section. (Discuss)
Visualization of the various routes through a portion of the Internet
Internet portal

The Internet is a global network of interconnected computers, enabling users to share information along multiple channels. Typically, a computer that connects to the Internet can access information from a vast array of available servers and other computers by moving information from them to the computer's local memory. The same connection allows that computer to send information to servers on the network; that information is in turn accessed and potentially modified by a variety of other interconnected computers. A majority of widely accessible information on the Internet consists of inter-linked hypertext documents and other resources of the World Wide Web (WWW). Computer users typically manage sent and received information with web browsers; other software for users' interface with computer networks includes specialized programs for electronic mail, online chat, file transfer and file sharing.

The movement of information in the Internet is achieved via a system of interconnected computer networks that share data by packet switching using the standardized Internet Protocol Suite (TCP/IP). It is a "network of networks" that consists of millions of private and public, academic, business, and government networks of local to global scope that are linked by copper wires, fiber-optic cables, wireless connections, and other technologies.

History
Main article: History of the Internet

Creation

The USSR's launch of Sputnik spurred the United States to create the Advanced Research Projects Agency, known as ARPA, in February 1958 to regain a technological lead.[2][3] ARPA created the Information Processing Technology Office (IPTO) to further the research of the Semi Automatic Ground Environment (SAGE) program, which had networked country-wide radar systems together for the first time. J. C. R. Licklider was selected to head the IPTO, and networking as a potential unifying human revolution.

Licklider moved from the Psycho-Acoustic Laboratory at Harvard University to MIT in 1950, after becoming interested in information technology. At MIT, he served on a committee that established Lincoln Laboratory and worked on the SAGE project. In 1957 he became a Vice President at BBN, where he bought the first production PDP-1 computer and conducted the first public demonstration of time-sharing.

At the IPTO, Licklider got Lawrence Roberts to start a project to make a network, and Roberts based the technology on the work of Paul Baran,[4] who had written an exhaustive study for the U.S. Air Force that recommended packet switching (as opposed to circuit switching) to make a network highly robust and survivable. After much work, the first two nodes of what would become the ARPANET were interconnected between UCLA and SRI (later SRI International) in Menlo Park, California, on October 29, 1969. The ARPANET was one of the "eve" networks of today's Internet.

Following on from the demonstration that packet switching worked on the ARPANET, the British Post Office, Telenet, DATAPAC and TRANSPAC collaborated to create the first international packet-switched network service. In the UK, this was referred to as the International Packet Switched Service (IPSS), in 1978. The collection of X.25-based networks grew from Europe and the US to cover Canada, Hong Kong and Australia by 1981. The X.25 packet switching standard was developed in the CCITT (now called ITU-T) around 1976.

X.25 was independent of the TCP/IP protocols that arose from the experimental work of DARPA on the ARPANET, Packet Radio Net and Packet Satellite Net during the same time period. Vinton Cerf and Robert Kahn developed the first description of the TCP protocols during 1973 and published a paper on the subject in May 1974. Use of the term "Internet" to describe a single global TCP/IP network originated in December 1974 with the publication of RFC 675, the first full specification of TCP that was written by Vinton Cerf, Yogen Dalal and Carl Sunshine, then at Stanford University. During the next nine years, work proceeded to refine the protocols and to implement them on a wide range of operating systems.

The first TCP/IP-based wide-area network was operational by January 1, 1983 when all hosts on the ARPANET were switched over from the older NCP protocols. In 1985, the United States' National Science Foundation (NSF) commissioned the construction of the NSFNET, a university 56 kilobit/second network backbone using computers called "fuzzballs" by their inventor, David L. Mills. The following year, NSF sponsored the conversion to a higher-speed 1.5 megabit/second network. A key decision to use the DARPA TCP/IP protocols was made by Dennis Jennings, then in charge of the Supercomputer program at NSF.

The opening of the network to commercial interests began in 1988. The US Federal Networking Council approved the interconnection of the NSFNET to the commercial MCI Mail system in that year and the link was made in the summer of 1989. Other commercial electronic e-mail services were soon connected, including OnTyme, Telemail and Compuserve. In that same year, three commercial Internet service providers (ISP) were created: UUNET, PSINet and CERFNET. Important, separate networks that offered gateways into, then later merged with, the Internet include Usenet and BITNET. Various other commercial and educational networks, such as Telenet, Tymnet, Compuserve and JANET were interconnected with the growing Internet. Telenet (later called Sprintnet) was a large privately funded national computer network with free dial-up access in cities throughout the U.S. that had been in operation since the 1970s. This network was eventually interconnected with the others in the 1980s as the TCP/IP protocol became increasingly popular. The ability of TCP/IP to work over virtually any pre-existing communication networks allowed for a great ease of growth, although the rapid growth of the Internet was due primarily to the availability of commercial routers from companies such as Cisco Systems, Proteon and Juniper, the availability of commercial Ethernet equipment for local-area networking, and the widespread implementation of TCP/IP on the UNIX operating system.

Growth
Graph of internet users per 100 inhabitants between 1997 and 2007 by International Telecommunication Union

Although the basic applications and guidelines that make the Internet possible had existed for almost two decades, the network did not gain a public face until the 1990s. On 6 August 1991, CERN, a pan European organisation for particle research, publicized the new World Wide Web project. The Web was invented by English scientist Tim Berners-Lee in 1989.

An early popular web browser was ViolaWWW, patterned after HyperCard and built using the X Window System. It was eventually replaced in popularity by the Mosaic web browser. In 1993, the National Center for Supercomputing Applications at the University of Illinois released version 1.0 of Mosaic, and by late 1994 there was growing public interest in the previously academic, technical Internet. By 1996 usage of the word Internet had become commonplace, and consequently, so had its use as a synecdoche in reference to the World Wide Web.

Meanwhile, over the course of the decade, the Internet successfully accommodated the majority of previously existing public computer networks (although some networks, such as FidoNet, have remained separate). During the 1990s, it was estimated that the Internet grew by 100% per year, with a brief period of explosive growth in 1996 and 1997.[5] This growth is often attributed to the lack of central administration, which allows organic growth of the network, as well as the non-proprietary open nature of the Internet protocols, which encourages vendor interoperability and prevents any one company from exerting too much control over the network. [6]

Using various statistics, AMD estimated the population of internet users to be 1.5 billion as of January 2009.[7]

University students' appreciation and contributions

New findings in the field of communications during the 1960s, 1970s and 1980s were quickly adopted by universities across North America.

Examples of early university Internet communities are Cleveland FreeNet, Blacksburg Electronic Village and NSTN in Nova Scotia.[8] Students took up the opportunity of free communications and saw this new phenomenon as a tool of liberation. Personal computers and the Internet would free them from corporations and governments (Nelson, Jennings, Stallman).

Graduate students played a huge part in the creation of ARPANET.[citation needed] In the 1960s, the network working group, which did most of the design for ARPANET's protocols, was composed mainly of graduate students.

Today's Internet

APOLLO NASA

Apollo program
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Apollo program insignia

The Apollo program was a human spaceflight program undertaken by NASA during the years 1961–1975 with the goal of conducting manned moon landing missions. In 1961, President John F. Kennedy announced a goal of landing a man on the moon by the end of the decade. It was accomplished on July 20, 1969 by the landing of astronauts Neil Armstrong and Buzz Aldrin, with Michael Collins orbiting above during the Apollo 11 mission. Five other Apollo missions also landed astronauts on the Moon, the last one in 1972. These six Apollo spaceflights are the only times humans have landed on another celestial body.[1] The Apollo program, specifically the lunar landings, is often cited as the greatest achievement in human history.[2][3]

Apollo was the third human spaceflight program undertaken by NASA, the space agency of the United States. It used Apollo spacecraft and Saturn launch vehicles, which were later used for the Skylab program and the joint American-Soviet Apollo-Soyuz Test Project. These later programs are thus often considered to be part of the overall Apollo program.

The goal of the program, as articulated by President Kennedy, was accomplished with only two major failures. The first failure resulted in the deaths of three astronauts, Gus Grissom, Ed White and Roger Chaffee, in the Apollo 1 launchpad fire. The second was an in-space explosion on Apollo 13, which badly damaged the spacecraft on the moonward leg of its journey. The three astronauts aboard narrowly escaped with their lives, thanks to the efforts of flight controllers, project engineers, backup crew members and the skills of the astronauts themselves.

The program set major milestones in the history of human spaceflight. This program stands alone in sending manned missions beyond low Earth orbit. Apollo 8 was the first manned spacecraft to orbit another celestial body, while Apollo 17 marks the time of the last moonwalk and also the last manned mission beyond low Earth orbit. The major space exploration milestones leading up to the moon landing include:

* first sub-orbital flight (1942)
* first orbital flight (1957)
* first unmanned lunar mission (1959)
* first man in space (1961)
* first manned lunar mission (1968).
* first manned lunar landing (1969).

The program spurred advances in many areas of technology peripheral to rocketry and manned spaceflight. These include major contributions in the fields of avionics, telecommunications, and computers. The program sparked interest in many fields of engineering, including pioneering work using statistical methods to study the reliability of complex systems made from component parts. The physical facilities and machines which were necessary components of the manned spaceflight program remain as landmarks of civil, mechanical, and electrical engineering. Many objects and artifacts from the program are on display at various locations throughout the world, notably at the Smithsonian's Air and Space Museums.

Boosters

When the team of engineers led by Wernher von Braun began planning for the Apollo program, it was not yet clear what sort of mission their rocket boosters would have to support. Direct ascent would require a booster, the planned Nova rocket, which could lift a very large payload. NASA's decision in favor of lunar orbit rendezvous re-oriented the work of Marshall Spaceflight Center towards the development of the Saturn 1B and Saturn V. While these were less powerful than the Nova would have been, the Saturn V was still much more powerful than any booster developed before—or since.

[edit] Saturn V
Main article: Saturn V
The Saturn V rocket launched Apollo 11 and her crew on its journey to the Moon, July 16, 1969.
Saturn V diagram from the Apollo 6 press kit

The Saturn V consisted of three stages and an Instrument Unit which contained the booster's guidance system. The first stage, the S-IC, consisted of five F-1 engines arranged in a cross pattern, which produced a total of 7.5 million pounds of thrust. They burned for only 2.5 minutes, accelerating the spacecraft to a speed of approximately 6000 miles per hour (2.68 km/s).[22] During development, the F-1 engines were plagued by combustion instability—if the combustion of propellants was not uniform across the flame front of an engine, pressure waves could build which would cause the engine to destroy itself. The problem was solved in the end through trial and error, fine-tuning the engines through numerous tests so that even small charges set off inside the engine would not induce instability.[23]

The second stage, the S-II, used five J-2 engines. They burned for approximately six minutes, taking the spacecraft to a speed of 15,300 miles per hour (6.84 km/s) and an altitude of about 115 miles (185 km).[24] At this point the S-IVB third stage took over, putting the spacecraft into orbit. Its one J-2 engine was designed to be restarted in order to make the translunar injection burn.[25]

[edit] Saturn IB
Main article: Saturn IB

The Saturn IB was an upgraded version of the earlier Saturn I. It consisted of a first stage made up of eight H-1 engines and a second S-IVB stage which was identical to the Saturn V's third stage. The Saturn IB had only 1.6 million pounds of thrust in its first stage—compared to 7.5 million pounds for the Saturn V—but was capable of putting a command and lunar module into earth orbit.[26] It was used in Apollo test missions and in both the Skylab program and the Apollo-Soyuz Test Program. In 1973 a refitted S-IVB stage, launched by a Saturn V, became the Skylab space station.

Global Warming

Global Warming

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For past climate change, see paleoclimatology and geologic temperature record.
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Global mean surface temperature anomaly relative to 1961–1990
Global mean surface temperature anomaly relative to 1961–1990

Mean surface temperature anomalies during the period 1999 to 2008 with respect to the average temperatures from 1940 to 1980
Mean surface temperature anomalies during the period 1999 to 2008 with respect to the average temperatures from 1940 to 1980

Global warming is the increase in the average temperature of the Earth's near-surface air and the oceans since the mid-twentieth century and its projected continuation. Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 years ending in 2005.[1][A] The Intergovernmental Panel on Climate Change (IPCC) concludes that anthropogenic greenhouse gases are responsible for most of the observed temperature increase since the middle of the twentieth century,[1] and that natural phenomena such as solar variation and volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect afterward.[2][3] These basic conclusions have been endorsed by more than 40 scientific societies and academies of science,[B] including all of the national academies of science of the major industrialized countries.[4][5]

Climate model projections summarized in the latest IPCC report indicate that global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century.[1] The uncertainty in this estimate arises from the use of models with differing climate sensitivity, and the use of differing estimates of future greenhouse gas emissions. Some other uncertainties include how warming and related changes will vary from region to region around the globe. Although most studies focus on the period up to 2100, warming is expected to continue beyond 2100 (even if emissions stop) because of the large heat capacity of the oceans and the lifespan of CO2 in the atmosphere.[6][7]

Increasing global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, likely including an expanse of the subtropical desert regions.[8] Other likely effects include Arctic shrinkage and resulting Arctic methane release, shrinkage of Amazon rainforest and Boreal forests, increases in the intensity of extreme weather events, changes in agricultural yields, modifications of trade routes, glacier retreat, species extinctions and changes in the ranges of disease vectors.

Political and public debate continues regarding the appropriate response to global warming. The available options are mitigation to reduce further emissions; adaptation to reduce the damage caused by warming; and, more speculatively, geoengineering to reverse global warming. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions. A successor to the first commitment period of the Kyoto protocol is expected to be agreed at the COP15 talks in December 2009.

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