Global Warming Facts

http://www.facebook.com/ScienceReason ... NASA Global Warming Facts: 2009 - Second Warmest Year on Record; End of Warmest Decade

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Global climate change ... NASA's eyes on the Earth: A warming world - global temperature update ... piecing together the temperature puzzle.

Each year, scientists at NASA'S Goddard Institute for Space Studies analyze global temperature data. The past year, 2009, tied as the second warmest year since global instrumental temperature records began 130 years ago. Worldwide, the mean temperature was 0.57°C (1.03°F) warmer than the 1951-1980 base period. And January 2000 to December 2009 came out as the warmest decade on record.

• http://climate.nasa.gov/warmingworld

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2009 was tied for the second warmest year in the modern record, a new NASA analysis of global surface temperature shows. The analysis, conducted by the Goddard Institute for Space Studies (GISS) in New York City, also shows that in the Southern Hemisphere, 2009 was the warmest year since modern records began in 1880.

Although 2008 was the coolest year of the decade, due to strong cooling of the tropical Pacific Ocean, 2009 saw a return to near-record global temperatures. The past year was only a fraction of a degree cooler than 2005, the warmest year on record, and tied with a cluster of other years — 1998, 2002, 2003, 2006 and 2007 1998 and 2007 — as the second warmest year since recordkeeping began.

"There's always an interest in the annual temperature numbers and on a given year's ranking, but usually that misses the point," said James Hansen, the director of GISS. "There's substantial year-to-year variability of global temperature caused by the tropical El Niño-La Niña cycle. But when we average temperature over five or ten years to minimize that variability, we find that global warming is continuing unabated."

January 2000 to December 2009 was the warmest decade on record. Throughout the last three decades, the GISS surface temperature record shows an upward trend of about 0.2°C (0.36°F) per decade. Since 1880, the year that modern scientific instrumentation became available to monitor temperatures precisely, a clear warming trend is present, though there was a leveling off between the 1940s and 1970s.

The near-record temperatures of 2009 occurred despite an unseasonably cool December in much of North America. High air pressures in the Arctic decreased the east-west flow of the jet stream, while also increasing its tendency to blow from north to south and draw cold air southward from the Arctic. This resulted in an unusual effect that caused frigid air from the Arctic to rush into North America and warmer mid-latitude air to shift toward the north.

"Of course, the contiguous 48 states cover only 1.5 percent of the world area, so the U.S. temperature does not affect the global temperature much,' said Hansen. In total, average global temperatures have increased by about 0.8°C (1.5°F) since 1880.

"That's the important number to keep in mind," said Gavin Schmidt, another GISS climatologist. "In contrast, the difference between, say, the second and sixth warmest years is trivial since the known uncertainty — or noise — in the temperature measurement is larger than some of the differences between the warmest years."

Decoding the Temperature Record: Climate scientists agree that rising levels of carbon dioxide and other greenhouse gases trap incoming heat near the surface of the Earth and are the key factors causing the rise in temperatures since 1880, but these gases are not the only factors that can impact global temperatures.

• http://www.giss.nasa.gov/research/news/20100121/
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[JonThm]

Photosynthesis limits global carbon dioxide at two parts per 1,000,000. A static level for last two centuries-free carbon dioxide was higher in the little ice age!

[JonThm]

Photosynthesis turns extra carbon dioxide in the air it into life on earth! It does not increase the level of this gas in the air!

[naturfagstoff]

Alan Hansen once again out with his scare mongering. According to him, the world should have been 2 deg. C warmer already. The thruth is it,s now cooler than in 1997.

[naturfagstoff]

Hocked stick (Mann) reversed the decade after it's invention. Does this mean that the world woke up from a global Ice-Age in the 1960s?

[geokrilov]

Pity NASA is in this global warming swindle. Average temperature is not rising since 1998.

Hockey stick got it's hook broken. This Pachauri magiсian needed to visit Ukraine this winter, where 80 people froze to death.

[mralanv]

@Princeofknowelege Global warming is real but we will have to learn it the hard way. Its effects can be felt all over the globe. Visit Northern Canada. Snowfall up there has been coming late during the past few years. I'm pretty sure other areas have suffered just as much. I have heard things are going pretty bad in the Andes and mountainous regions in Asia. I don't know if Al Gore wants profits or not but I know that GW is real.

[clackervalve12]

Fuck the Earth.

[JonThm]

Nuclear power made up and fatal fiction of global warming

[Princeofknowelege]

I might be entitled to believe global warming if al gore would actually do debates against people like lord monckton but everytime a real expert comes around to challenge al gore he runs away. I find that suspicious if he really believed what he was telling people then wouldn't he like to prove it at any given opportunity not just his own speeches. I think al gore is a fraud, you can call me fag or an asshole but I find him suspicious in his work.

[hannahbunny12]

Hello, we are doing a project for the Think Quest project and we are sending a request to use your video on it. Me and my group would greatly appreciate it :D of you can sen me your email address so I can email you the permission statement. Thank you very much. Sincerely , Hannah Morrison