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SAN FRANCISCO, June 13 (Xinhua) -- Social networking giant Facebook will likely go public in the first quarter of 2012 with a valuation that could top 100 billion U.S. dollars, U.S. media reported on Monday.In a report, CNBC quoted people familiar with the matter as saying that Facebook could submit filing to register its securities with the U.S. Securities and Exchange Commission (SEC) as early as October or November this year.People who are on Wall Street and track this information told the business news television channel that they think the Facebook initial public offering (IPO), if and when it happens could value the company of more than 100 billion dollars.A factor in the company's IPO timing is the SEC's requirement that companies must disclose financial information if they have more than 500 private investors."The company has until the end of April 2012 to disclose their financials, but they may just want to get ahead of that by doing a formal initial public offering, I'm told. And that could happen in the first quarter of the year," said CNBC Wall Street reporter Kate Kelly.Facebook is also facing internal pressure as employees have not been permitted to sell their private shares on the secondary market since last spring. An IPO would make it easier for employees to monetize their shares, said Kelly, citing sources.Facebook shares have been traded in private markets such as Sharepost.com, which puts the social networking company's valuation at 85 billion dollars.Meanwhile, latest data show that Facebook is losing users last month in the United States, Canada and several European countries, indicating that the company could have hit the limits of expansion in its mature markets.

WASHINGTON, June 6 (Xinhua) -- The tropics and much of the Northern Hemisphere are likely to experience an irreversible rise in summer temperatures within the next 20 to 60 years if atmospheric greenhouse gas concentrations continue to increase, according to a new climate study by Stanford University scientists. The results will be published later this month in the journal Climatic Change.In the study, the Stanford team concluded that many tropical regions in Africa, Asia and South America could see "the permanent emergence of unprecedented summer heat" in the next two decades. Middle latitudes of Europe, China and North America -- including the United States -- are likely to undergo extreme summer temperature shifts within 60 years, the researchers found."According to our projections, large areas of the globe are likely to warm up so quickly that, by the middle of this century, even the coolest summers will be hotter than the hottest summers of the past 50 years," said the study's lead author, Noah Diffenbaugh, an assistant professor of environmental Earth system science and fellow at the Woods Institute for the Environment at Stanford. The study is co-authored by Stanford research assistant Martin Scherer."When scientists talk about global warming causing more heat waves, people often ask if that means that the hottest temperatures will become 'the new normal,'" Diffenbaugh said. " That got us thinking -- at what point can we expect the coolest seasonal temperatures to always be hotter than the historically highest temperatures for that season?"To determine the seasonal impact of global warming in coming decades, Diffenbaugh and Scherer analyzed more than 50 climate model experiments -- including computer simulations of the 21st century when global greenhouse gas concentrations are expected to increase, and simulations of the 20th century that accurately " predicted" the Earth's climate during the last 50 years. The analysis revealed that many parts of the planet could experience a permanent spike in seasonal temperatures within 60 years."We also analyzed historical data from weather stations around the world to see if the projected emergence of unprecedented heat had already begun," Diffenbaugh said. "It turns out that when we look back in time using temperature records, we find that this extreme heat emergence is occurring now, and that climate models represent the historical patterns remarkably well."According to both the climate model analysis and the historical weather data, the tropics are heating up the fastest. "We find that the most immediate increase in extreme seasonal heat occurs in the tropics, with up to 70 percent of seasons in the early 21st century (2010-2039) exceeding the late-20th century maximum," the authors wrote.Tropical regions may see the most dramatic changes first, but wide swaths of North America, China and Mediterranean Europe are also likely to enter into a new heat regime by 2070, according to the study.This dramatic shift in seasonal temperatures could have severe consequences for human health, agricultural production and ecosystem productivity, Diffenbaugh said. As an example, he pointed to record heat waves in Europe in 2003 that killed 40,000 people. He also cited studies showing that projected increases in summer temperatures in the Midwestern United States could reduce the harvest of staples, such as corn and soybeans, by more than 30 percent.

UNITED NATIONS, June 8 (Xinhua) -- Marking 30 years of the HIV- AIDS pandemic, scores of heads of state and government and ministers took to the UN General Assembly podium on Wednesday to list their country's accomplishments and list challenges in the battle.The General Assembly High Level Meeting on AIDS is taking place 10 years after the UN Special Session on HIV/AIDS and also marks five years since signing of the Political Declaration in which UN member states committed to moving towards universal access to HIV prevention, treatment, care and support.UN Secretary-General Ban Ki-moon UN recalled how three decades ago AIDS was spreading while "Today, we have a chance to end this epidemic once and for all."Now, instead of fear, there is hope, he said."Today, HIV is on a steep decline in some of the most affected countries. Countries like Ethiopia, South Africa, Zambia and Zimbabwe," he said. "They had the largest epidemics in the world, and they have cut infection rates by one quarter.""Globally, more than 6 million people now get treatment," Ban said. "All of these advances come thanks to you and the commitments you made, first 10 years ago and then again in 2006. Today, the challenge has changed. Today, we gather to end AIDS."However, President Joseph Deiss of the General Assembly said 10 million people still have no access to treatment and far too many people were still being infected, adding it was necessary to continue complementary and closely-linked prevention, treatment, care and support measures."We have reached a critical moment in time," he said. "We must take a holistic approach and integrate the response to AIDS into broader development programs."Michel Sidibe, executive director of the Joint UN Program on HIV/AIDS (UNAIDS), recalled how 30 years the disease was called the gay plague and slime disease. People were afraid of each other and there was no hope."This image should not disappear. It is part of our history," he said.Sidibe said the AIDS movement was the story of a people breaking the conspiracy of silence, demanding equity and dignity, confronting societies'wrongs, seizing their rights, and making a passionate call for social justice. Since then, a compact had been made between the global North and the South, which had produced lifesaving results.Now, More than 6.6 million people are being treated in low- and middle- income countries, he said, pointing out that since the initial success stories in Uganda and Thailand 56 countries, including 36 in Africa, have been able to stabilize the epidemic and reduce the number of infections significantly.Infections have been reduced by 35 percent in South Africa and by more than half in India, the UNAIDS chief said. In China, the HIV mortality rate had fallen by 64 percent, Sidibe said. Many other countries had reached universal access to treatment.He voiced what was repeated several times, and that was a call for "a transformational agenda" of "zero infections, zero discrimination and zero AIDS-related deaths."To put a personal face on the disease, a woman from Ukraine openly living with HIV, Tetyana Afansiadi, told her story to the delegates.She told how she had been living with HIV and using drugs for 13 years, had hepatitis C for almost 11 years but now has a husband and an 8-year-old son. Neither have HIV.Three years ago she took part in a drug therapy program that has enabled her to live, work, and take care of her son."Drug dependency and HIV-infection require treatment, not prosecution," she said.Given that opioid substitution therapy in her home city had changed the lives of people like her, it was time to stop refusing antiretroviral treatment to people who used drugs.While the heads of states and government and ministers, usually those heading up health departments, spoke in the General Assembly hall under bright lights, scores more of delegates attended five panel sessions and about 40 individual side events.Some samplings from the spotlighted dark-green podium in the great hall:President Paul Kagame of Rwanda, said, "It is time to galvanize member states to commit to a transformative agenda that overcomes the barriers to an effective, equitable and sustainable response to HIV and AIDS."Jose Angel Cordova Villalobos, health minister of Mexico, called for states to implement friendly, non-discriminatory healthcare systems as well as sex education in order to prevent the spread of HIV/AIDS."To achieve this, we call to all the countries congregated here today in order that your actions are based in the framework of respect to the human rights and focusing on gender equity, that allow to consolidate an effective response to the HIV/AIDS without stigmas, discrimination, homophobia, transphobia; as well as any type of violence," he said, referring, in part, to transsexuals.The vice president of Mauritius, Monique Bellepeau, said, "The adverse impact of the AIDS epidemic on the socioeconomic progress, particularly in the developing countries, dictates that there is no time for complacency."She added, "After wrestling with AIDS for the past three decades, we are today equipped with a vast body of knowledge and various new tools to urgently complete the task. No less than strict prevention efforts and universal access to treatment, care and support are required."The speeches continue Thursday and on the final day of the three-day meeting, UN member states are expected to adopt a declaration to guide country responses to HIV over the next five years.

WASHINGTON, July 20 (Xinhua) -- Using the Hubble Space Telescope, astronomers have discovered a fourth moon orbiting the icy dwarf planet Pluto, the U.S. National Aeronautics and Space Administration (NASA) announced Wednesday in a statement. The tiny, new satellite, temporarily designated P4, was uncovered in a Hubble survey searching for rings around the dwarf planet.P4 was first seen in a photo taken with Hubble's Wide Field Camera 3 on June 28. It was confirmed in subsequent Hubble pictures taken on July 3 and July 18. It is the smallest moon discovered around Pluto. It has an estimated diameter of 8 to 21 miles (13 to 34 km). By comparison, Charon, Pluto's largest moon, is 648 miles (1,043 km) across, and the other moons, Nix and Hydra, are in the range of 20 to 70 miles in diameter (32 to 113 km).Two labeled images of the Pluto system taken by the Hubble Space Telescope's Wide Field Camera 3 ultraviolet visible instrument with newly discovered fourth moon P4 circled. The image on the left was taken on June 28, 2011. The image of the right was taken on July 3, 2011."I find it remarkable that Hubble's cameras enabled us to see such a tiny object so clearly from a distance of more than 3 billion miles (5 billion km)," said Mark Showalter of the SETI Institute in California, who led this observing program with Hubble.P4 is located between the orbits of Nix and Hydra, which Hubble discovered in 2005. Charon was discovered in 1978 at the U.S. Naval Observatory and first resolved using Hubble in 1990 as a separate body from Pluto.The dwarf planet's entire moon system is believed to have formed by a collision between Pluto and another planet-sized body early in the history of the solar system. The smashup flung material that coalesced into the family of satellites observed around Pluto.The finding is a result of ongoing work to support NASA's New Horizons mission, scheduled to fly through the Pluto system in 2015. The mission is designed to provide new insights about worlds at the edge of our solar system. Hubble's mapping of Pluto's surface and discovery of its satellites have been invaluable to planning for New Horizons' close encounter."This is a fantastic discovery," said New Horizons' principal investigator Alan Stern of the Southwest Research Institute in Colorado. "Now that we know there's another moon in the Pluto system, we can plan close-up observations of it during our flyby."

WASHINGTON, May 30 (Xinhua) -- After nearly 12 days together in orbit, U.S. space shuttle Endeavour undocked from the International Space Station on Sunday night, NASA announced on Monday.According to NASA, the undocking took place at 11:55 p.m. EDT ( 0355 GMT Monday) as the spacecraft sailed 215 miles (346 km) above Bolivia.Pilot Greg Johnson, at the aft flight deck controls, flew Endeavour in a circle around the station at distances of about 450 to 650 feet. Crew members took still and video images of the station.The Space Shuttle Endeavour is seen as it departs the International Space Station after undocking in this image from NASA TV May 29, 2011.As Johnson was about to begin the flyaround, Commander Mark Kelly radioed mission control that he could see the two-billion-U. S.-dollar Alpha Magnetic Spectrometer (AMS) particle physics detector Endeavour had brought to orbit. "It's a new day for science on the space station," he said to mission control.The AMS will be left at the space station to scour the universe for clues about dark matter and antimatter. Endeavour is scheduled to land at the Kennedy Space Center at 2:35 a.m. (0635 GMT) on Wednesday.During their stay at the space station, the Endeavour crew conducted four spacewalks to complete construction of the U.S. side of the 100-billion-dollar outpost, a project of 16 nations that has been being assembled in orbit since 1998.They also brought up a logistics carrier with spare parts and performed some maintenance and installation work during the four spacewalks, the last to be carried out by an American shuttle crew.NASA plans to decommission Endeavour, its youngest shuttle with 25 voyages, and send it to a museum in Los Angeles for display.NASA's 30-year-old shuttle program is ending due to high operating costs. The Obama administration wants to spur private companies to get into the space taxi business, freeing NASA to focus on deep space exploration and new technology development.When the U.S. space shuttle program officially ends later this year, the Russian space program's Soyuz capsule will be the only method for transporting astronauts to and from the space station.

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