GLOBAL WARMING - HUMAN INFLUENCE DON'T FORGET TO ADD A COMMENT AT THE END OR GO THE BOTTOM OF THE SCREEN TO SEE WHAT OTHERS HAVE WRITTEN |
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“Studies indicate that the average global surface temperature has increased by approximately 0.5-1.0°F (0.3-0.6°C) over the last century. This is the largest increase in surface temperature in the last 1,000 years and scientists are predicting an even greater increase over this century. Average global temperatures may increase by 1.4-5.8ºC (that's 2.5 - 10.4º F) by the end of the 21st century.” |
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GHG ONLINE - GREENHOUSE GAS ONLNE - Human Influence and Greenhouse Gas Quantities Increase (MUST CONFIRM WITH DATA) |
Since around the time of the industrial revolution in Western countries levels of carbon dioxide, methane and nitrous oxide of all risen dramatically. Fossil fuel combustion, increasingly intensive agriculture and an expanding global human population have been the primary causes for this rapid increase. Methane concentrations have seen the biggest relative increase in the last 200 years, concentrations more than doubling. However, the rate of methane increase appears now to be lessening and it it concentrations of carbon dioxide and nitrous oxide which are the man-made greenhouse gases which we are likely to see increase most in the next 100 years. |
Malthusianism turned into neo-Malthusianism in the '60s with Paul Ehrlich's "population bomb" scare. That was followed in 1972 by the Club of Rome's influential Limits to Growth, predicting that the world would soon run short of mineral resources. But just as Ehrlich's predicted food riots in U.S. cities did not materialize (the problem turned out to be obesity), so too have the Club of Rome's calculated shortage dates for various minerals proven to be highly exaggerated. At about the same time, a miniscare over global cooling emerged, in response to falling temperatures between the 1940s and 1970s, which were blamed on rising sulfur dioxide emissions from coal plants. But a feared return of a Little Ice Age soon gave way to rising temperatures and a more urgent alarm: global warming from man-made greenhouse emissions. In the mid-1980s, John Holdren predicted that climate-related catastrophes might kill as many as 1 billion people before the year 2020. But the Harvard University professor (and Baker conference speaker) has more recently stated: "That the impacts of global climate disruption may not become the dominant sources of environmental harm to humans for yet a few more decades cannot be a great consolation." |
NEW ZEALAND CLIMATE CHANGE COALITION - Alarmism has called for food shortage, global cooling, and other natural disasters that would destroy the world, none came true. (MUST CONFIRM WITH DATA) |
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AMERICAN GEOPHYSICAL UNION - Human Impacts on Climate (MUST CONFIRM WITH DATA) |
Human activities are increasingly altering the Earth's climate. These effects add to natural influences that have been present over Earth's history. Scientific evidence strongly indicates that natural influences cannot explain the rapid increase in global near-surface temperatures observed during the second half of the 20th century. Human impacts on the climate system include increasing concentrations of atmospheric greenhouse gases (e.g., carbon dioxide, chlorofluorocarbons and their substitutes, methane, nitrous oxide, etc.), air pollution, increasing concentrations of airborne particles, and land alteration. A particular concern is that atmospheric levels of carbon dioxide may be rising faster than at any time in Earth's history, except possibly following rare events like impacts from large extraterrestrial objects. |
And in the same month, Richard A. Kerr (4), in a commentary for Science, reported that: ...many climate experts caution that it is not at all clear yet that human activities have begun to warm the planet--or how bad greenhouse warming will be when it arrives. Such doubts were recognized by those responsible for the drafting of IPCC95. Thus Benjamin D. Santer (4), Convening Lead Author of Section 8 of IPCC95 is quoted by Richard Kerr (4) to have said: ...quite clearly few scientists would say the attribution issue [that warming is due to human-activity-induced greenhouse] is a done deal. And John Houghton, Leading Editor of IPCC95 as well as the earlier reports IPCC90 and IPCC92, told me as recently as July 8, 1996 (personal communication): No one to my knowledge who is informed is claiming certainty of detection or attribution [of anthropogenic influence on global climate]; certainly the IPCC is not...
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NATURAL SCIENCE - There is still uncertainty to whether Global Warming is Man-Made (CONFIRMED WITH DATA - There is still uncertainty in the science world. See link: IS GLOBAL WARMING ACCEPTED? |
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| From a letter in Nature by John T. Houghton (5) we also know that the statement that "The balance of evidence suggests that there is a discernible human influence on global climate," was adopted at the plenary session of the IPCC in Madrid in November 1995, which meeting, he says, constituted "the final part of the very comprehensive and thorough IPCC process of peer review." The 177 delegates to this plenary (from 96 countries and including representatives from 14 NGOs and 28 IPCC lead authors) subjected the Summary for Policymakers (SPM) to line-by-line approval and "accepted" the background scientific chapters [i.e., they satisfied themselves that these chapters present a "comprehensive, objective and balanced view" of the science]. | NATURAL SCIENCE - There is still uncertainty to whether Global Warming is Man-Made (CONFIRMED WITH DATA - There is still uncertainty in the science world. See link: IS GLOBAL WARMING ACCEPTED? |
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