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Originally posted by xmotex
The deniers will keep pretending it's not happening until they have to commute by rowboat - and probably even then.
The objections to anthropogenic warming are not scientific but ideological.
Originally posted by TheAvenger
Originally posted by forestlady
The Avenger: So we should believe you just because you say so? Why don't you explain to us why GW is a hoax?
Global warming is real. The belief that humans and nothing else causes it is erroneous. At best, humans have been minor contributors. IN MY OPINION.
You want my justification for my thinking? Read my ATS A.G.W. thread which has over 400 posts. Believe whatever you choose, it makes me no difference. I have nothing to prove or any case to make. I am an independent scientist trying in my own small way to get people to learn the truth about climate change.
Me not open minded? My complaint here was that the news media doesn't show both sides of the issue, especially since us 33% A.G.W. skeptics are not a small minority. 66% is also not a consensus as the "warmies" would have you believe. Al Gore has ZERO scientific credentials, so almost anyone here is more qualified to render opinions on A.G.W. than he is. PERIOD.
How do you argue for open mindedness when you don't show me any? It would seem that I am the open minded one here. I want both sides of the issue examined and/or reported by the press. Again, I could care less who believes or doesn't believe what I have written. I will point out, however, that intelligent people examine ALL of the information available before deciding an issue for themselves. It's a somewhat rare human trait these days known as "thinking".
Originally posted by forestlady
I HAVE examined both sides. Your science to me, doesn't hold water. I didn't say one thing in this thread that would indicate I'm close-minded. You OTOH choose to ridicule those who don't agree with you and then say it doesn't matter to you.
Originally posted by AMANNAMEDQUEST
Theres another interesting thread about AL Gores connections with NASA and Google and the coming IA. Al gore even says its ten years before the point of no return.
Could be some links
www.abovetopsecret.com...
Originally posted by Hawker9
Is it really so impossible or unthinkable that it is maybe a combination of many, many different factors, none of which should be discounted?
Originally posted by Hawker9
Well, like I said before, the CO2 produced by humans probably does have some impact - large or small - on the whole deal, and, like I also said before, better safe than sorry. Plus, what harm could it do if we tried to reduce CO2 and other greenhouse gas emissions? The least it would do is make the air we breathe just a little bit healthier.
First-Ever 5,000-Year Record of Hurricanes Compiled
...................
Clues in the dirt
When scientists examined the sediment cores from the lake, the coarse-grained beach sand, as well as bits of shell, stood out from the lake’s normal finer-grained silt--a tell-tale signal that a hurricane struck the island at that point in history.
The 5,000-year record the researchers lifted from the dirt showed large and dramatic fluctuations in hurricane activity, with long stretches of both intense storm activity and quiet periods. The research was detailed in the May 24 issue of the journal Nature.
Originally posted by Muaddib
Not to mention the fact that CO2 increases lag temperature increases, and most of the time by hundreds of years.
Climate of the Past Discussions, 3, 435-467, 2007
New constraints on the gas age-ice age difference along the EPICA ice cores, 0–50 kyr
L. Loulergue, F. Parrenin, T. Blunier, J.-M. Barnola, R. Spahni, A. Schilt, G. Raisbeck, J. Chappellaz
Gas is trapped in polar ice sheets at ~50–120 m below the surface and is therefore younger than the surrounding ice. Firn densification models are used to evaluate this ice age-gas age difference (Δage) in the past. However, such models are not well tested on low accumulation and cold sites of the East Antarctic plateau, especially for periods with different climatic conditions. Here we bring new constraints to test a firn densification model applied to the EPICA Dome C (EDC) site for the last 50 kyr, by linking the EDC ice core to the EPICA Dronning Maud Land (EDML) ice core, both in the ice phase (using volcanic horizons) and in the gas phase (using rapid methane variations). We use the structured 10Be peak, occurring 41 kyr before present (BP) and due to the low geomagnetic field associated with the Laschamp event, to experimentally estimate the Δage and Δdepth during this event. It allows us to evaluate the model and to link together climatic archives from EDC and EDML to NorthGRIP (Greenland). Our results reveal an overestimate of the Δage by the firn densification model during the last glacial period at EDC. Tests with different accumulation rates and temperature scenarios do not entirely resolve this discrepancy. Our finding suggests that the phase relationship between CO2 and EDC temperature inferred at the start of the last deglaciation (lag of CO2 by 800±600 yr) is overestimated and that the CO2 increase could well have been in phase or slightly leading the temperature increase at EDC.
P. D. Tyson, W. Karlén, K. Holmgren and G. A. Heiss (in press) The Little Ice Age and Medieval Warming in South Africa. South African Journal of Science.
The Little Ice Age and Medieval Warming in South Africa
.....
The climate of the interior of South Africa was around 1oC cooler in the Little Ice Age and may have been over 3°C higher than at present during the extremes of the medieval warm period.
A team of scientist from Austria and Germany located three stalagmites in the Spannagel Cave located around 2,500 m above sea level at the end of the Tux Valley in Tyrol (Austria) close to the Hintertux glacier. The temperature of the cave stays near freezing and the relative humidity in the cave is always at or near 100%. The stalagmites grew at a rate between 17 and 75 millionths of a meter per year and are nearly 10,000 years old.
...............
The stalagmite is screaming to us that many periods in the past 9,000 years were warmer than present-day conditions!
The five scientists determined that the mean temperature of the Medieval Warm Period in northwest Spain was 1.5°C warmer than it was over the 30 years leading up to the time of their study, and that the mean temperature of the Roman Warm Period was 2°C warmer. Even more impressive was their finding that several decadal-scale intervals during the Roman Warm Period were more than 2.5°C warmer than the 1968-98 period, while an interval in excess of 80 years during the Medieval Warm Period was more than 3°C warmer.
Chilean Continental Slope, Southern Chile
--------------------------------------------------------------------------------
Reference
Lamy, F., Hebbeln, D., Röhl, U. and Wefer, G. 2001. Holocene rainfall variability in southern Chile: a marine record of latitudinal shifts of the Southern Westerlies. Earth and Planetary Science Letters 185: 369-382.
Description
The authors used the iron content from an ocean sediment core taken from the Chilean continental slope (41°S, 74.45°W) as a proxy for historic rainfall in this region during the Holocene. Results indicated several centennial and millennial-scale phases of rainfall throughout this period, including an era of decreased rainfall "coinciding with the Medieval Warm Period," which was followed by an era of increased rainfall during the Little Ice Age. Given these results, they concluded that their data "provide further indications that both the LIA and MWP were global climate events."
Glacial geological evidence for the medieval warm period
Abstract It is hypothesised that the Medieval Warm Period was preceded and followed by periods of moraine deposition associated with glacier expansion. Improvements in the methodology of radiocarbon calibration make it possible to convert radiocarbon ages to calendar dates with greater precision than was previously possible. Dating of organic material closely associated with moraines in many montane regions has reached the point where it is possible to survey available information concerning the timing of the medieval warm period. The results suggest that it was a global event occurring between about 900 and 1250 A.D., possibly interrupted by a minor readvance of ice between about 1050 and 1150 A.D.
Accumulation and 18O records for ice cores from Quelccaya ice cap. The period of the Little Ice Age stands out clearly as an interval of colder temperature (lower 18O) and higher accumulation. Such evidence demonstrates the Little Ice Age was a climatic episode of global significance. From World Data Center for Paleoclimatology (educational slide set).
Originally posted by Hawker9
And, not to be repetitive, what's the harm in just trying to cut down on the "crap we spew into the air"? It just means healthier air, and who doesn't like that?
Originally posted by Hawker9
Plus I think sometimes we get too bogged down in the facts to take a minute to sit and just think about things with an objective mindset.
Originally posted by melatonin
Or maybe not...
Global Warming 101
Human Fingerprints
Earth's surface has undergone unprecedented warming over the last century, particularly over the last two decades. Astonishingly, every single year since 1992 is in the current list of the 20 warmest years on record.
n its 2001 report, the Intergovernmental Panel on Climate Change stated, "There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities." Carbon dioxide from fossil fuel burning and land clearing has been accumulating in the atmosphere, where it acts like a blanket keeping Earth warm and heating up the surface, ocean, and atmosphere. As a result, current levels of carbon dioxide in the atmosphere are higher than at any time during the last 650,000 years.
Climate is influenced by many factors, both natural and human. Things that increase temperature, such as increases in heat-trapping emissions from cars and power plants or an increase in the amount of radiation the sun emits, are examples of "positive" forcings or drivers. Volcanic events and some types of human-made pollution, both of which inject sunlight-reflecting aerosols into the atmosphere, lower temperature and are examples of "negative" forcings or drivers. Natural climate drivers include the sun's energy output, aerosols from volcanic activity, and changes in snow and ice cover. Human climate drivers include heat-trapping emissions from cars and power plants, aerosols from pollution, and soot particles.
Changes in the sun during the twentieth century have warmed both the troposphere and stratosphere. But human activities have increased heat-trapping emissions and decreased stratospheric ozone.
Measurements show that global average temperature has risen by 1.4 degrees Fahrenheit in the last 100 years, with most of that happening in the last three decades....
....Even accounting for the occasional short-lived cooling from volcanic events and moderate levels of cooling from aerosol pollution as well as minor fluctuations in the sun's output in the last 30 years, heat-trapping emissions far outweigh any other current climate driver. Once again, our scientific fingerprinting identifies human activities as the main driver of our warming climate.
Melanie Fitzpatrick (Earth and Space Sciences and Atmospheric Sciences at the University of Washington and UCS consultant) prepared this summary with input from Brenda Ekwurzel (Union of Concerned Scientists) and reviews by Philip Mote (Climate Impacts Group at the University of Washington and Washington's state climatologist), Richard Gammon (Chemistry, Oceanography, and Atmospheric Sciences at the University of Washington) and Peter Frumhoff (Union of Concerned Scientists). (c)2006 Union of Concerned Scientists
References
1. U.S. National Aeronautics and Space Administration (NASA) Goddard Institute for Space Studies. 2006. Global temperature trends: 2005 summation. New York, NY. Online at data.giss.nasa.gov...
2. U.S. National Oceanic and Atmospheric Administration (NOAA) National Climate Data Center. 2006. Climate of 2005 - annual report. Asheville, NC. Online at www.ncdc.noaa.gov...
3. Intergovernmental Panel on Climate Change. 2001. Climate change 2001: The scientific basis. Cambridge, UK: Cambridge University Press.
4. EPICA. 2004. Eight glacial cycles from an Antarctic ice core. Nature 429:623-628.
5. Petit, J.R., J. Jouzel, D. Raynaud, N.I. Barkov, J.-M. Barnola, I. Basile, M. Bender, J. Chappellaz, M. Davis, G. Delaygue, M. Delmotte, V.M. Kotlyakov, M. Legrand, V.Y. Lipenkov, C. Lorius, L. Pépin, C. Ritz, E. Saltzman, and M. Stievenard. 1999. Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica. Nature 399:429-436.
6. Siegenthaler, U., T.F. Stocker, E. Monnin, D. Lüthi, J. Schwander, B. Stauffer, D. Raynaud, J.-M. Barnola, H. Fischer, V. Masson-Delmotte, and J. Jouzel. 2005. Stable carbon cycle-climate relationship during the late Pleistocene. Science 310:1313-1316.
7. Hansen, J., L. Nazarenko, R. Ruedy, M. Sato, J. Willis, A. Del Genio, D. Koch, A. Lacis, K. Lo, S. Menon, T. Novakov, J. Perlwitz, G. Russell, G.A. Schmidt, and N. Tausnev. 2005. Earth's energy imbalance: Confirmation and implications. Science 308:1431-1435.
8. Barnett, T.P., D.W. Pierce, K.M. AchutaRao, P.J. Gleckler, B.D. Santer, J.M. Gregory, and W.M. Washington. 2005. Penetration of human-induced warming into the world's oceans. Science 309:284-287.
9. Levitus, S., J. Antonov, and T. Boyer. 2005. Warming of the world ocean, 1955-2003. Geophysical Research Letters 32. Online at www.agu.org... (doi:10.1029/2004GL021592).
10. Santer, B.D., M.F. Wehner, T.M.L. Wigley, R. Sausen, G.A. Meehl, K.E. Taylor, C. Ammann, J. Arblaster, W.M. Washington, J.S. Boyle, and W. Bruggemann. 2003. Contribution of anthropogenic and natural forcing to recent tropospheric height changes. Science 301:479-483.