Changes

'''Anthropogenic global warming''' (AGW) is a theory that suggests that human activity is causing the [[Earth]] to warm. The theory posits that greenhouse gases, including carbon dioxide, methane, nitrous oxide, and water vapor, trap solar warmth on the planet. Computer models suggest that industrial and vehicular emissions could lead to catastrophic warming. [[Leftist]]s use this theory as a basis to propose cuts in energy production and consumption and promote de-industrialization.

'''Anthropogenic global warming''' (AGW) is a theory that suggests that human activity is causing the [[Earth]] to warm. The theory posits that greenhouse gases, including carbon dioxide, methane, nitrous oxide, and water vapor, trap solar warmth on the planet. Computer models suggest that industrial and vehicular emissions could lead to catastrophic warming. [[Leftist]]s use this theory as a basis to propose cuts in energy production and consumption and promote de-industrialization.

Radiosonde (weather balloon) and satellite data shows that the lower troposphere warmed by 0.44 degrees Celsius between 1979 and 2014. This corresponds to a rate of 1.7 degrees per century. If the AGW theory were correct, the lower troposphere would be warming at a rate of 3.1 degrees per century, according to an average of 102 climate models used by the Intergovernmental Panel on Climate Change (IPCC).<ref>"[https://www.newcriterion.com//cm/images/THE%20CLIMATE%20SURPRISE%20PAMPHLET.pdf The Climate Surprise Pamphet]", ''The New Criterion'', 2016. Taken from chart "All 3 Global Temperature Dataset Types Disagree with the Climate Model During the Period of Greatest Greenhouse Concentration." Despite the numerous flaws detailed in the "Harry Read Me" file, the IPCC still favors the CRU's HadCRUT4 temperature record. This record shows warming of less than 0.6 degree from 1979 to 2014. See "[[Global_warming#The_temperature_record |The Temperature Record]]."</ref>

Radiosonde (weather balloon) and satellite data shows that the lower troposphere warmed by 0.44 degrees Celsius between 1979 and 2014. This corresponds to a rate of 1.7 degrees per century. If the AGW theory were correct, the lower troposphere would be warming at a rate of 3.1 degrees per century, according to an average of 102 climate models used by the Intergovernmental Panel on Climate Change (IPCC).<ref>"[https://www.newcriterion.com//cm/images/THE%20CLIMATE%20SURPRISE%20PAMPHLET.pdf The Climate Surprise Pamphet]", ''The New Criterion'', 2016. Taken from chart "All 3 Global Temperature Dataset Types Disagree with the Climate Model During the Period of Greatest Greenhouse Concentration." Despite the numerous flaws detailed in the "Harry Read Me" file, the IPCC still favors the CRU's HadCRUT4 temperature record. This record shows warming of less than 0.6 degree from 1979 to 2014. See "[[Global warming#The temperature record|The Temperature Record]]."</ref>

Radiosonde and satellite data are the most accurate sources for global temperature, but they do not go back far enough to reveal the long-term trend. A reanalysis of weather station data for 1943 to 2012 by U.S. climate researcher Roy Spencer shows that after a cooler period in the 1960s and 1970s, U.S. temperatures returned to their earlier level. Unlike the official weather station record, Spencer's data includes only those stations that recorded temperature at a consistent time of day.<ref name="Spencer" />  

Radiosonde and satellite data are the most accurate sources for global temperature, but they do not go back far enough to reveal the long-term trend. A reanalysis of weather station data for 1943 to 2012 by U.S. climate researcher Roy Spencer shows that after a cooler period in the 1960s and 1970s, U.S. temperatures returned to their earlier level. Unlike the official weather station record, Spencer's data includes only those stations that recorded temperature at a consistent time of day.<ref name="Spencer" />  

==Difficulties with the theory==

==Difficulties with the theory==

*'''Carbon dioxide is insignificant as a greenhouse gas.''' The level of CO₂ in the Earth's atmosphere is only 400 parts per million. Ninety to 95 percent of the greenhouse effect is due to water vapor.<ref>Friedenreich and Ramaswamy, "Solar Radiation Absorption by Carbon Dioxide, Overlap with Water, and a Parameterization for General Circulation Models," Journal of Geophysical Research 98 (1993):7255-7264)</ref> The IPCC claims that water vapor acts as a "positive feedback," i.e. warming creates more humidity, which leads to additional warming. There are humidity measurements going back to 1948, and they show no upward trend.<ref>"[https://wattsupwiththat.com/global-climate/ global climate]," ''Watt's Up with That''</ref> More humidity could lead to more clouds and therefore to cooling and to negative feedback. So why assume positive feedback? AGW works only if water vapor is a positive feedback, so that is what the IPCC must claim.<br/>Although Obama has denounced elevated carbon dioxide levels as "carbon pollution," greenhouse operators commonly increase the level of CO₂ to 1,000 ppm or more to enhance plant growth.<ref>"[https://www.sciencedaily.com/releases/2015/12/151210101819.htm Plant growth enhanced by increased carbon dioxide, but food webs give rise to significant variations]", ''Science News'', December 10, 2015.<br/>Harrison H. Schmitt and William Happer, "[http://arizonaskywatch.com/article/articles/In%20defense%20of%20carbon%20dioxide.pdf In Defense of Carbon Dioxide]," ''Wall Street Journal'', May 8, 2013.</ref>

*'''Carbon dioxide is insignificant as a greenhouse gas.''' The level of CO₂ in the Earth's atmosphere is only 400 parts per million. Ninety to 95 percent of the greenhouse effect is due to water vapor.<ref>Friedenreich and Ramaswamy, "Solar Radiation Absorption by Carbon Dioxide, Overlap with Water, and a Parameterization for General Circulation Models," Journal of Geophysical Research 98 (1993):7255-7264</ref> The IPCC claims that water vapor acts as a "positive feedback," i.e. warming creates more humidity, which leads to additional warming. There are humidity measurements going back to 1948, and they show no upward trend.<ref>"[https://wattsupwiththat.com/global-climate/ global climate]," ''Watt's Up with That''</ref> More humidity could lead to more clouds and therefore to cooling and to negative feedback. So why assume positive feedback? AGW works only if water vapor is a positive feedback, so that is what the IPCC must claim.<br/>Although Obama has denounced elevated carbon dioxide levels as "carbon pollution," greenhouse operators commonly increase the level of CO₂ to 1,000 ppm or more to enhance plant growth.<ref>"[https://www.sciencedaily.com/releases/2015/12/151210101819.htm Plant growth enhanced by increased carbon dioxide, but food webs give rise to significant variations]", ''Science News'', December 10, 2015.<br/>Harrison H. Schmitt and William Happer, "[http://arizonaskywatch.com/article/articles/In%20defense%20of%20carbon%20dioxide.pdf In Defense of Carbon Dioxide]," ''Wall Street Journal'', May 8, 2013.</ref>

[[Image:NASA-1024x933.jpg|thumb|right|A composite map of [[Antarctica]] showing areas of greatest warming in red. The Wilkins Ice Shelf lies off the peninsula in the top left corner, and shows extensive warming. Overall, Antarctica shows little warming, and many areas to the  East (right) are almost cooling.<ref>Roberts, Greg (April 18, 2009). [http://www.news.com.au/antarctic-ice-is-growing-not-melting-away/story-0-1225700043191 "Antarctic ice is growing, not melting away."] News.com.au.  Retrieved on September 25, 2014.</ref>]]

[[Image:NASA-1024x933.jpg|thumb|right|A composite map of [[Antarctica]] showing areas of greatest warming in red. The Wilkins Ice Shelf lies off the peninsula in the top left corner, and shows extensive warming. Overall, Antarctica shows little warming, and many areas to the  East (right) are almost cooling.<ref>Roberts, Greg (April 18, 2009). [http://www.news.com.au/antarctic-ice-is-growing-not-melting-away/story-0-1225700043191 "Antarctic ice is growing, not melting away."] News.com.au.  Retrieved on September 25, 2014.</ref>]]

*'''The Earth has warmed or cooled many times. Historically, warm periods are associated with favorable climate.''' The [[Roman Warm Period]] (250 BC to 180 AD) featured temperatures comparable to those of modern times. This was followed by the Dark Ages Cold Period (450-950 AD).<ref>"[http://www.co2science.org/subject/d/summaries/dacpeurope.php Dark Ages Cold Period (Europe) - Summary]", ''CO₂ Science'', 1 June 2005.</ref> The Medieval Warm Period was even warmer than the Roman period and lasted from 950 to 1300.<ref>John P. Rafferty, "[https://global.britannica.com/science/medieval-warm-period Medieval warm period (MWP)]", ''Britannica''</ref> From the 14th century to the early 19th century, there was a Little Ice Age.<ref>John P. Rafferty, Stephen T. Jackson, "[https://global.britannica.com/science/Little-Ice-Age Little Ice Age (LIA)]", ''Britannica''.</ref><ref>See the graphs at "[http://www.climate4you.com/ Global temperatures]," Climate4you.</ref><ref>Bastasch, Michael, "[http://dailycaller.com/2013/12/13/study-earth-was-warmer-in-roman-medieval-times/ Study: Earth was warmer in Roman, Medieval times]", ''The Daily Caller''. For a peer-reviewed paper, see Moberg, A., et al. 2005 "[ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moberg2005/nhtemp-moberg2005.txt 2,000-Year Northern Hemisphere Temperature Reconstruction]", ''World Data Center for Paleoclimatology''. The Moberg data set is charted [https://i0.wp.com/i90.photobucket.com/albums/k247/dhm1353/Moberg-1.png here].</ref>

*'''The Earth has warmed or cooled many times. Historically, warm periods are associated with favorable climate.''' The [[Roman Warm Period]] (250 BC to 180 AD) featured temperatures comparable to those of modern times. This was followed by the Dark Ages Cold Period (450-950 AD).<ref>"[http://www.co2science.org/subject/d/summaries/dacpeurope.php Dark Ages Cold Period (Europe) - Summary]", ''CO₂ Science'', 1 June 2005.</ref> The Medieval Warm Period was even warmer than the Roman period and lasted from 950 to 1300.<ref>John P. Rafferty, "[https://global.britannica.com/science/medieval-warm-period Medieval warm period (MWP)]", ''Britannica''</ref> From the 14th century to the early 19th century, there was a Little Ice Age.<ref>John P. Rafferty, Stephen T. Jackson, "[https://global.britannica.com/science/Little-Ice-Age Little Ice Age (LIA)]", ''Britannica''.</ref><ref>See the graphs at "[http://www.climate4you.com/ Global temperatures]," Climate4you.</ref><ref>Bastasch, Michael, "[http://dailycaller.com/2013/12/13/study-earth-was-warmer-in-roman-medieval-times/ Study: Earth was warmer in Roman, Medieval times]", ''The Daily Caller''. For a peer-reviewed paper, see Moberg, A., et al. 2005 "[ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moberg2005/nhtemp-moberg2005.txt 2,000-Year Northern Hemisphere Temperature Reconstruction]", ''World Data Center for Paleoclimatology''. The Moberg data set is charted [https://i0.wp.com/i90.photobucket.com/albums/k247/dhm1353/Moberg-1.png here].</ref>

[[Image:Teller_Card_100dpi.jpg|600px|center|thumb| Global Warming Petition]]

[[Image:Teller_Card_100dpi.jpg|600px|center|thumb| Global Warming Petition]]

In June, 1974, ''[[Time]]'' magazine published its front page article, ''Science: Another Ice Age?'',<ref name="Time"/> while a report by the [[CIA]] in the same year stated that, "The western world's leading climatologists have confirmed recent reports of a detrimental global climatic change”, noting such things as that the "world's snow and ice cover had increased by at least 10 to 15 percent", and in the "Canadian area of [[Arctic]] Greenland, below normal temperatures were recorded for 19 consecutive months", which was unique during the last 100 years.  A "major climatic shift" was speculated, which would threaten the "the stability of most nations.” It further warned that "Scientists are confident that unless man is able to effectively modify the climate, the northern regions, such as Canada" to "major areas in northern China, will again be covered with 100 to 200 feet of ice and snow", within the next 2500 years—or sooner.<ref>Central Intelligence Agency (August 1974).  [http://www.climatemonitor.it/wp-content/uploads/2009/12/1974.pdf ''A Study of Climatological Research as it Pertains to Intelligence Problems''], pp. 1, 5, 7, 16.  Retrieved from Climatemonitor [Italy] on September 30, 2014.</ref>  

In June, 1974, ''[[Time]]'' magazine published its front-page article, ''Science: Another Ice Age?'',<ref name="Time"/> while a report by the [[CIA]] in the same year stated that, "The western world's leading climatologists have confirmed recent reports of a detrimental global climatic change”, noting such things as that the "world's snow and ice cover had increased by at least 10 to 15 percent", and in the "Canadian area of [[Arctic]] Greenland, below normal temperatures were recorded for 19 consecutive months", which was unique during the last 100 years.  A "major climatic shift" was speculated, which would threaten the "the stability of most nations.” It further warned that "Scientists are confident that unless man is able to effectively modify the climate, the northern regions, such as Canada" to "major areas in northern China, will again be covered with 100 to 200 feet of ice and snow", within the next 2500 years—or sooner.<ref>Central Intelligence Agency (August 1974).  [http://www.climatemonitor.it/wp-content/uploads/2009/12/1974.pdf ''A Study of Climatological Research as it Pertains to Intelligence Problems''], pp. 1, 5, 7, 16.  Retrieved from Climatemonitor [Italy] on September 30, 2014.</ref>  

Also in 1974, Nigel Calder, former editor of ''New Scientist'' and atmospheric researcher wrote in his book ''The Weather Machine'', "One might argue that there is a virtual certainty of the next ice age starting some time in the next 2000 years. Then the odds are only about 20-to-1 against it beginning in the next 100 years."  

Also in 1974, Nigel Calder, former editor of ''New Scientist'' and atmospheric researcher wrote in his book ''The Weather Machine'', "One might argue that there is a virtual certainty of the next ice age starting some time in the next 2000 years. Then the odds are only about 20-to-1 against it beginning in the next 100 years."