Man-Made Global Warming

Total Page:16

File Type:pdf, Size:1020Kb

Man-Made Global Warming SATURDAY 30 JANUARY 2010 STAY UPDATED THROUGH THE DAY Business Standard NEW DELHI OPINION Visit www.business-standard.com 13 BusinessStandard VOLUME XVI NUMBER 136 MAN-MADE GLOBAL WARMING Playing with fire The climate-change ‘science’ continues to unravel, says DEEPAK LAL ILLUSTRATION BY BINAY SINHA t has been a bad two months for the der YS Rajasekhar Reddy got sup- A LONG, FAST DECLINE: 7 YEARS’ GLOBAL WEEKEND port from the Maoists during the purveyors of the “science” of man- COOLING AT 3.6°F (2°C)/CENTURY state elections, support that helped made global warming. The BA- °C RUMINATIONS SIC group of countries (Brazil, South 0.8 Global monthly temperature anomalies, January 2002 unseat the Telugu Desam. Like Africa, India and China) stood firm 0.7 to Feb ‘09; IPCC predicts warming at +2.4, +3, +3.9, +4.7, +5.3°C/century IPCC TN NINAN Mr Soren today, Mr Reddy at the Iat Copenhagen from being bounced in- 0.6 0.5 time began with a soft approach to an agreement on mandatory carbon 0.4 ne of the strengths of the In- to the Maoists, and got tough on- emission cuts. With the Democrat’s de- 0.3 dian system is its ability to ly after a year or two had passed. feat in Massachusetts, there is little hope 0.2 co-opt rebellious and sepa- The question that bears ask- of President Barack Obama pursuing the 0.1 O US climate change Bill, leaving Europe 0 ratist forces and bring them into the ing is whether the Maoists have got 2003 2005 2007 2009 — particularly the UK — out on a limb Figure 1: How the IPCC’s projections of rising temperatures have increasingly political mainstream. The Com- so much purchase in select pock- diverged since 2001 from the trend in actual temperatures. with their legislation of targets for sav- Source: Science and Public Policy Institute. munists were persuaded to take part ets of the country that they are now age CO2 emission cuts which, if imple- in the parliamentary system of democ- able to influence the outcome of CLIMATE CHANGE OVER THE PAST 1,000 YEARS THE HOCKEY STICK GRAPH AS SHOWN mented, will lead to their rapid descent AS SHOWN BY THE IPCC IN 1990 BY THE IPCC IN 2001 racy, and the separatist forces in Tamil state elections, and thereby de- into the Stone Age. © IPCC (1990) Nadu and Mizoram became the main- termine who will become the chief But an equally important drama has NORTHERN HEMISPHERE 0.5 C) C) ° stream. The system is large and minister. If they have twice tried the been playing in New Delhi with Dr Ra- ° accommodative enough to make gambit and if it worked on both oc- jendra Pachauri, the head of the Inter- Little ice age 0 national Panel on Climate Change (IPCC), room for all comers — and more casions, in that they won a reprieve Medical would come into the mainstream from police action that helped them having to retract various purportedly “sci- warm period -0.5 entific” claims made in the panel’s 2007 change ( Temperature if it were not for the instigation and to catch their breath and re-group, report. The one which has rightly come to -1.0 Departures in temperature ( support that Pakistan and China pro- they will naturally conclude that the fore in India is Glaciergate, concern- from the 1961 to 1990 average vide for the recalcitrant elements. the gambit is worth trying again. ing the IPCC’s claim that the Himalayan 1000 AD1500 AD 1900 AD Year 1000 1200 1400 1600 1800 2000 Figure 2: Climate change over the past 1,000 years: JT Houghton et. al, IPCC First Figure 3: The ‘hockey stick’ graph: Mann ME, et al (1999), northern hemisphere That said, a strange thing is hap- With West Bengal elections not far glaciers would melt by 2035. When the Assessment Report, 1990. temperatures during the last millennium: inferences, uncertainties and limitations pening when it comes to the Maoists, away, it is important to ask who us- government-sponsored report by eminent because the shoe seems to be on the es whom when the Maoists form Indian glaciologist Dr Vijaya Raina came other foot. In at least two states, it links with mainstream parties. out in November, saying that the IPCC’s collaboration with the met office’s Hadley the 2001 IPCC report. losing credibility”. (Wegman Report, 2006 claims were baseless and recklessly Centre after obtaining the agreement of Till two Canadians, statistician Stephen is available at gochttp://www.cimateau- is the Maoists who have used the The stand-out example of how alarmist, it was dismissed by Dr Pachau- other met offices around the world. McIntyre and economist Ross McKitrick, dit.org/pdf/others/07142006_Weg- mainstream parties for their own things can go wrong is provided by ri, a railway engineer with a PhD in eco- The unwillingness to release the da- published an article showing that “there man_Report.pdf). ends, with the latter willing to play Punjab in the 1980s. It was initial- nomics, as being “arrogant” and “voodoo ta was for two reasons. First, since 1977 was an error in a routine calculation step… These revelations of the debauch- along in the hope of grabbing pow- ly the Congress that tried to upstage science”. Subsequently, he had to eat crow when sunspot activity has decreased that falsely identified a hockey stick shape ing of climate change “science” by the er. The latest example is Shibu Soren, the Akali Dal by setting up Jarnail as he and the IPCC had to admit that their as the Sun seems to have gone to sleep, as the dominant pattern in the data. The IPCC continue apace. As I write, there is who as the newly-elected chief min- Singh Bhindranwale. Later, Akali predictions about Himalayan glaciers were both terrestrial and more accurate satel- flawed computer program can even pull a report that the IPCC’s 2007 claim that ister of Jharkhand wants to go politicians developed links with the without scientific foundations. lite temperature readings show the Earth out spurious hockey stick shapes from global warming is linked to a rise in nat- soft on the Maoists and has, in fact, militants and saw them as a use- Glaciergate had been preceded by Cli- is cooling, even as CO2 emissions have lists of trendless random numbers” (En- ural disasters has also been shown to be mategate in November, when a hacker increased (See fig. 1), contradicting ergy and Environment, 2003:752-771). scientifically invalid. The IPCC vice-chair- called off police action soon after ful ally for specific objectives — and leaked hundreds of emails from the the man-made global warming theory. With the subsequent furore, the US man says it will be reviewed. assuming office. Whether he has there too, it was not clear who was Climate Research Unit (CRU) at the Uni- Second, they have been keen to resur- Congress set up two scientific commit- The unravelling of this politicised cli- changed course after his meeting a using whom. What the country versity of East Anglia. These show that rect the infamous “hockey stick”. tees to examine climate history. They up- mate “science” has already had political couple of days ago with the home remembers is that Punjab came Professor Phillip Jones, the director of held McIntyre and McKitrick, and one consequences. At the recent BASIC en- minister remains to be seen, but it to the brink, and peace returned on- the CRU — the source of the most im- ill 1999, when a recent physics Phd- investigation chaired by Dr Edward Weg- vironmental ministers gathering, Xi Zhen- is hard to ignore the possibility that ly after a heavy price had been paid, portant of the four sets of temperature Tturned-climatologist, Michael Mann, man — a leading statistician — excori- hua, the Chinese representative, said that Mr Soren is delivering in return for in terms of bloodshed and violence, data on which the IPCC relies — along published a paper on the 1,000-year tem- ated the Mann papers as well as his var- Beijing would keep an “open attitude the support that he got from the including Operation Bluestar and with a tight network of colleagues had perature record, the accepted trend was ious highly placed supporters who had to the disputes in the scientific com- for years discussed various tactics to avoid given by fig. 2, which appeared in the 1990 tried to whitewash them. Wegman also munity” as “there is a view that climate Maoists during the recent elections the assassination of Indira Gandhi. releasing their data to outsiders under IPCC report (reproduced in its Chairman commissioned a “social network analy- change is caused by cyclical trends in na- to the state assembly. Because the Maoists speak in freedom of information laws. They kept John Houghton’s book Global Warm- sis” of Mann’s defenders to find out how ture itself”. As a start, to help in an In neighbouring West Bengal, the name of the poor, they tend coming up with innumerable excuses to ing (1994)). This shows that temperatures independent they were, which found that honest resolution of these disputes, the the Marxists continually beat the to attract some degree of sympa- conceal the background data on which in the Medieval Warm Period had been they “are closely connected and thus ‘in- IPCC needs to be disbanded. If neces- drum about Mamata Banerjee’s Tri- thy and so a political party doing their findings and temperature records higher than those predicted to increase dependent studies’ may not be as inde- sary, by the BASIC countries withdraw- namool Congress being in league a quick-and-dirty deal with them are based.
Recommended publications
  • Andrew Montford's the Hockey Stick Illusion Is One of the Best Science
    Andrew Montford‘s The Hockey Stick Illusion is one of the best science books in years. It exposes in delicious detail, datum by datum, how a great scientific mistake of immense political weight was perpetrated, defended and camouflaged by a scientific establishment that should now be red with shame. It is a book about principal components, data mining and confidence intervals—subjects that have never before been made thrilling. It is the biography of a graph. I can remember when I first paid attention to the ―hockey stick‖ graph at a conference in Cambridge. The temperature line trundled along with little change for centuries, then shot through the roof in the 20th century, like the blade of an ice-hockey stick. I had become somewhat of a sceptic about the science of climate change, but here was emphatic proof that the world was much warmer today; and warming much faster than at any time in a thousand years. I resolved to shed my doubts. I assumed that since it had been published in Nature—the Canterbury Cathedral of scientific literature—it was true. I was not the only one who was impressed. The graph appeared six times in the Intergovernmental Panel on Climate Change (IPCC)‘s third report in 2001. It was on display as a backdrop at the press conference to launch that report. James Lovelock pinned it to his wall. Al Gore used it in his film (though describing it as something else and with the Y axis upside down). Its author shot to scientific stardom. ―It is hard to overestimate how influential this study has been,‖ said the BBC.
    [Show full text]
  • Red Lines & Hockey Sticks
    Red Lines & Hockey Sticks A discourse analysis of the IPCC’s visual culture and climate science (mis)communication Thomas Henderson Dawson Department of ALM Theses within Digital Humanities Master’s thesis (two years), 30 credits, 2021, no. 5 Author Thomas Henderson Dawson Title Red Lines & Hockey Sticks: A discourse analysis of the IPCC’s visual culture and climate science (mis)communication. Supervisor Matts Lindström Abstract Within the climate science research community there exists an overwhelming consensus on the question of climate change. The scientific literature supports the broad conclusion that the Earth’s climate is changing, that this change is driven by human factors (anthropogenic), and that the environmental consequences could be severe. While a strong consensus exists in the climate science community, this is not reflected in the wider public or among poli- cymakers, where sceptical attitudes towards anthropogenic climate change is much more prevalent. This discrep- ancy in the perception of the urgency of the problem of climate change is an alarming trend and likely a result of a failure of science communication, which is the topic of this thesis. This paper analyses the visual culture of climate change, with specific focus on the data visualisations com- prised within the IPCC assessment reports. The visual aspects of the reports were chosen because of the prioriti- sation images often receive within scientific communication and for their quality as immutable mobiles that can transition between different media more easily than text. The IPCC is the central institutional authority in the climate science visual discourse, and its assessment reports, therefore, are the site of this discourse analysis.
    [Show full text]
  • Climate Change and the Power Industry - a Literature Research
    Climate Change And The Power Industry - A Literature Research - by Dr. rer. nat. Rüdiger Beising October 2006 1st Revision, March 2007 Issued by: VGB PowerTech e.V. To be obtained from: VGB PowerTech Service GmbH Publishing house for technological-scientific papers Postfach 10 39 32, D-45039 Essen Tel. +49-(0)201 8128-200 Fax +49-(0)201 8128-329 Email: [email protected] 2 3 Table of contents Preface / Summary 7 1 The Climate of the Earth 18 1.1 Atmosphere 18 1.2 Hydrosphere 20 1.3 Cryosphere 21 1.4 Geosphere 21 1.5 Biosphere 21 2 The Carbon Dioxide Circulation 23 2.1 Geosphere 24 2.2 Ocean 24 2.3 Atmosphere 25 2.4 Biosphere 25 3 The Radiation Budget and the Greenhouse Effect 27 3.1 Radiation Balance 27 3.2 Radiative Forcing 28 3.3 The Greenhouse Effect 29 4 Natural Influencing Factors on the Climate 33 4.1 The Sun 33 4.1.1 Solar Radiation 34 4.1.2 Cosmic Particle Radiation and Geomagnetic Field 38 4.2 Volcanoes 41 4.3 North Atlantic Oscillation - NAO 43 4.4 Southern Oscillation El Niño – ENSO 46 4.5 Thermohaline Circulation (THC) 47 4.6 Natural Greenhouse Gases 49 5 Anthropogenic Influencing Factors on the Climate 50 5.1 Anthropogenic Greenhouse Gases 50 5.1.1 Water Vapour (H2O) 54 5.1.2 Carbon Dioxide (CO2) 55 5.1.3 Methane (CH4) 57 5.1.4 Nitrous Oxide (N2O) 60 5.1.5 Ozone 61 5.1.6 F-Gases and Halogenated Hydrocarbons (FC, CFC, HFC) 62 5.1.7 Sulphur Hexafluoride (SF6) 64 5.1.8 Indirect, Ozone-Forming Greenhouse Gases 64 5.1.8.1 Nitrogen Oxides (NOx) without Dinitrogen Oxide 64 5.1.8.2 Organic Compounds without Methane (NMVOC) 65 5.1.8.3 Carbon Monoxide (CO) 65 5.2 Sulphur Dioxide (SO2) 66 5.3.
    [Show full text]
  • Academy Affirms Hockey-Stick Graph
    29.6 News 1032-3 6/28/06 1:05 AM Page 1032 Vol 441|29 June 2006 NEWS Academy affirms hockey-stick graph WASHINGTON DC IPCC It’s probably the most politicized graph in science — an icon of the case for climate change to some, and of flawed science in the service of that case to others — and it has coloured the climate-change debate for nearly a decade. Now the US National Academy of Sciences (NAS) has weighed in with a report on the ‘hockey-stick’ plot, which it hopes will finally lay the controversy to rest. The graph purports to chart global tempera- tures over the past millennium; a sharp rise at the current end is the ‘blade’ that makes the otherwise flattish line look like a hockey stick. Climate groups have claimed it as evi- dence of dangerous global warming; sceptics, especially in the United States and Canada, have questioned the study’s merit and statisti- cal methodology. In its report, released on 22 June, the NAS committee more-or-less endorses the work behind the graph. But it criticizes the way Cause for controversy: Michael Mann used proxies for climate change, such as tree rings, to produce a that the plot was used to publicize climate- picture of Earth’s changing climate over the past millennium. change concerns. And it leaves open big ques- COGHILL T. tions about whether researchers should be warming sceptics claim that the current warm- and M. E. Mann et al. Geophys. Res. Lett. 26, obliged to make their data available (see ing trend is a rebound from a ‘little ice age’ 759–762; 1999).
    [Show full text]
  • Artikel Herunterladen
    «I CALL THEM INACTIVISTS» An interview with Michael E. Mann, by Christopher Schrader THE CLIMATE SCIENTIST MICHAEL MANN TALKING ABOUT THE NEW TRICKS AND DECEPTION STRATEGIES CURRENTLY BEING USED BY THE FOSSIL FUEL INDUSTRY. Blatant lying doesn’t work anymore. So the friends and beneficiaries of coal, oil, and natural gas have developed a new strategy. They depict individual behavior as the key to the success or failure of climate protection, thus deflecting attention from their own actions and obfuscating political solutions to the crisis. Michael E. Mann analyzes how it all works in his latest book, «The New Climate War». The climate scientist from Pennsylvania has been following the activities of opponents to effective climate protection for decades. And he has no choice. For he has been on the hit list, so to speak, of climate change deniers and fossil fuel lobbyists for over 20 years, ever since he and two colleagues produced the first reconstruction of the last thousand years of mean global temperatures. After remaining relatively unremarkable, temperatures began increasing dramatically with the onset of the Industrial Revolution. The resulting curve quickly came to be known as the «hockey stick graph», on account of the resemblance of its abrupt, steep incline to the shape of a hockey stick. When the graph figured prominently in the third report of the Intergovernmental Panel on Climate Change (2001), Mann became a target. On account of his work, as well as emails that were hacked in 2009 from an English university and made public, his opponents have been trying – ultimately in vain – to show that he has manipulated data in an attempt to destroy his credibility.
    [Show full text]
  • Climategate & Penn State the Case for an Independent Investigation
    POLICY BRIEF Vol. 22, No. 02 from the COMMONWEALTH FOUNDATION January 2010 Climategate & Penn State The Case for an Independent Investigation Introduction The release of embarrassingly candid emails from the Climate Research Unit (CRU) of the University of East Anglia has intensified, if not vindicated, suspicions that scientific misconduct has played a significant role in fueling alarmism over supposed catastrophic manmade global warming. Just days after news broke about what has been dubbed “Climategate,” Penn State University (PSU) announced that it would investigate the conduct of Michael To avoid a glaring Mann, a professor in PSU’s Department of Meteorology and a prominent figure in conflict of interest the Climategate emails. and to ensure that the investiga- While PSU is to be commended for recognizing that Climategate is a serious tion of Mann is matter and that an investigation into Michael Mann’s conduct is warranted, the in- credible, the vestigation constitutes a conflict of interest for the university. Mann’s climate work Pennsylvania brings enough visibility, prestige, and revenue to PSU to legitimately call into ques- General Assembly tion the university’s ability to do a thorough and unbiased investigation. should commis- sion an external To avoid this glaring conflict of interest and ensure that the investigation of and independent Mann is credible, the Pennsylvania General Assembly should commission an exter- investigation into nal and independent investigation into Mann’s potential scientific misconduct. Mann’s potential What is Climategate? scientific misconduct. In late-November 2009, more than a thousand emails and other documents were released from the Climate Research Unit (CRU) of the University of East Anglia in the United Kingdom.
    [Show full text]
  • Global Temperature Change
    Global Temperature Change George H. Holliday, PhD., P.E., BCEE, ASME Life Fellow Holliday Environmental Services, Inc. Abstract This study was initiated to review the existing technical literature regarding the possibility of anthropogenic carbon dioxide releases causing climate change. The literature search demonstrates no peer reviewed evidence exists, except computer climate simulations, supporting the concept of man-generated carbon dioxide or other greenhouse gases causing increased global temperature. Most reports contain statements, without technical support or reference, regarding the need to control carbon dioxide e.g., “The use of these fossil fuels results in the release of carbon dioxide (CO2), which is widely believed to contribute to global climate change.” (USDOE, 2007). On the contrary, the existing technical literature report cyclic variations in climate temperature change for about 2 million years. In part, this conclusion is supported, by oxygen-28 to oxygen-16 gas ratios from analyses of ice cores covering a period of 250,000 years. The literature search leads to the conclusion anthropogenic carbon dioxide and other greenhouse gas emissions do not result in climate temperature increases. Introduction The earth’s climate forever changes in a predicable cyclic manner, apparently dictated by solar activity, Bond et al. (2001). We know Romans recorded climate warming between 200 BC and 600 AD, Lamb (1977a). In Europe, between 600 and 1300 AD, the Medieval Warming occurred. The Little Ice Age (1300 to 1850 AD) is dramatically documented by tax records of the abandonment of Greenland by the Norse population in about 1300 after nearly 300 years of moderate temperatures, when farming prospered.
    [Show full text]
  • Inverse Square Law • Obliquity • Eccentricity • Precession • Ice Ages
    Last Time… Are rising temperatures part of normal fluctuations? How did climate vary before the Industrial Revolution? Key Concepts 1.0 0.5 e (°C) e g han Hockey Stick Graph c 0 ature r pe Proxy Measures m e –0.5 T –Ice Cores –1.0 1000 1200 1400 1600 1800 2000 –Tree Rings Year –Glacial Extent –Corral Reefs 18 H2 O 16 H2 O H 16O 2 H 16O 18 2 18 H2 O Isotopes H2 O 16 H 16O H2 O 2 16 The Rainout Effect H2 O 1 ring = 1 year Tree Rings Errors in measurement –Reflect local conditions –Stressful conditions during growing season prevents formation of a growth ring –Temporary growth stop, then continued growth in one season leads to a false ring. Trees can live for thousands of years Wood from ancient structures can be used to look further back –One chronology in Germany extends more than 10,000 years. Oldest living thing on Earth: Bristle cone pine 4,844 rings Summer temperature changes in Europe over the past 2,500 years 2 1 0 –1 Temperature–2 anomalies (°C) –400 1/1 400 800 1200 1600 2000 Year (B.C.E. / C.E.) Coral Rings Similar to tree rings Corals form exoskeletons of calcium carbonate. –More growth during good conditions –Dense growth during poor conditions (storms) –Creates annual bands Can Tell Us About Temperature Heavy and light oxygen gets incorporated into the exoskeleton. – More heavy oxygen means it was a cool year (less evaporation) – Less heavy oxygen means it was warmer (more evaporation) Can date back as far as 1565 years Another temp proxy Glacial Extent Assessment of the size of glaciers for the past 400 years – Direct measurements – Paintings – Etchings – Photographs – Satellite images Glacial Extent: reconstruction of temperature changes based on lengths of glaciers 0.8 Alps Asia 0.4 S.
    [Show full text]
  • Eg, Optical Depth, Single Scattering Albedo, Asymmetry Parameter
    AOSC400-2015 October 8, Lecture # 11 Aerosols (refresher and continuation): o Composition, size distribution, optical properties (e.g., optical depth, single scattering albedo, asymmetry parameter) o Climate sensitivity o Aerosol radiative forcing o What is IPCC? o IPCC estimates of aerosol radiative forcing Copyright@2015 University of Maryland This material may not be reproduced or redistributed, in whole or in part, without written permission of Rachel T. Pinker Junge distribution of aerosol sizes. Power law distributions are often used to model the aerosol populations, but because of the peaks in the accumulation and coarse modes, such models are only useful over limited ranges. Other observed distributions of aerosols. Upper figure: Normal days Lower figure: During dust outbreak Bimodal Variability in size distribution during “normal” days and dust outbreak in Africa. Aerosol Size Distribution The total aerosol optical depth due to extinction may be written as M e ( , z ) dz 0 (2) Let the height dependent aerosol size distributionbe defined by n( z, a) (cm-3μm-1) Then, the extinction coefficient (cm-1) is given as e ( , z ) e ( a , ) n ( z , a ) da 0 (3 where e stands for the extinction cross section (cm2) for an individual particle. For the retrieval purpose, the Junge size distribution can be assumed to a good approximation. Aerosol Size Distribution The total aerosol optical depth due to extinction may be written as M e ( , z ) dz 0 (2) Remember from Lecture 10: dz dz R R R where 0 0 R = Rayleigh mass scattering coefficient R = volume scattering coefficient Let the height dependent aerosolR R size distribution be defined by n(z, a) (cm‐3μm‐1).
    [Show full text]
  • Exploring Climate Change: Controversy
    Exploring Climate Change Controversy Introduction Anything as important, challenging and complicated as climate change is bound to attract a great deal of discussion and disagreement. The media and newspapers often present stories about climate change in a sensational and emotive way and some high profile TV documentaries and books have questioned the influence of humans on the climate. At best, these live debates, attention-grabbing headlines and ‘climate scandals’ often leave the general public feeling that scientists don’t agree. At worst, they force people to switch off and lose interest in this important global issue. The reality is that there is an unprecedented consensus among world scientists that global warming is caused by human activity (known as anthropogenic climate change). Yes, scientists are still in disagreement about exactly what the impacts will be but the main body of evidence for climate change is widely accepted by the scientific community. In this section, we look into the controversies surrounding climate change including 'Climategate', the 'Hockey Stick' debate and criticism of the IPCC. This section also explores the influence of climate critics and the impact they have had on public opinion. Collectively these issues highlight the importance of developing informed views based on established scientific evidence. Windfarms too have generated controversial debate along with the Beauly-Denny powerline, recently given the go-ahead by the Scottish Government. These developments continue to face significant challenges, even as they come online and become a feature of the Scottish landscape. Reflective questions What climate controversies have featured in the media recently? Does the controversial nature of the issue excite, challenge, confuse or bore you? What is your opinion? The Public Photo credit: Liverpool Biennial - One Year in Liverpool.
    [Show full text]
  • The Rise and Fall of the Hockey Stick
    11/17/2016 The rise and fall of the Hockey Stick Home Subscribe A Sceptical Mind having doubts about global warming The rise and fall of the Hockey Stick The rise of the so called Hockey Stick graph is pivotal to the story of the rise of the alarm about man made global warming. The fall of the Hockey Stick graph is pivotal to the rise of scepticism about man made global warming. Here is the story of the rise and fall of the Hockey Stick. The Background A central and critical plank of the alarmist global warming case is that the current phase of warming that started in the late 19th century is unprecedented. Why is this claim so important? Because if a similar or greater warming phase has occurred in the very recent past, before human CO2 emissions had caused CO2 levels to rise, then clearly any such recent warming must have been natural and was not caused by CO2. And if any recent similar warming phase was natural then clearly the current phase of warming could also be a natural phenomena. If the current phase of warming could be natural then those arguing that it was primarily caused by human CO2 emissions would have to prove their hypothesis. And this is something they cannot do. The only “proof” that CO2 is currently forcing up global temperatures is the claim that the current warming is somehow unusual, unique and unnatural. That’s the total argument for CO2 forcing. Something unprecedented is happening to the climate and CO2 is the only candidate for what is causing this unique phenomena.
    [Show full text]
  • An Overview of Scientific Debate of Global Warming and Climate Change Akhtar S* Department of Geography, University of Karachi, Pakistan
    Open Access Journal of Aquatic Sciences and Oceanography RESEARCH ARTICLE An Overview of Scientific Debate of Global Warming and Climate Change Akhtar S* Department of Geography, University of Karachi, Pakistan *Corresponding author: Akhtar S, Department of Geography, University of Karachi, Pakistan, Tel: 0333-3536896, E-mail: [email protected] Citation: Akhtar S (2019) An Overview of Scientific Debate of Global Warming and Climate Change. J Aqua Sci Oceanography 1: 201 Abstract Climate change is not the new phenomenon. The palaeo-climatic studies reveal that during the Pleistocene and Holocene periods several warm and cold periods occurred, resulted change of sea level and change in climatic processes like rise and fall of global average temperature and rainfall. The last medieval warm period was observed from 950 to 1350 AD, followed by the little Ice Age from 1400 to 1900 AD. Occurrence of these climatic changes and their impacts are considered due to natural processes that are geological and astronomical. In 1970s environmentalists and some climate scientists pointed that earth’s average temperature is rising linked with the anthropogenic causes of global warming and emission of carbon dioxide through fossil fuels. In late 1980s the problem was discussed in politics and media. To examine and monitor the global rise of temperature and its impacts due to the emission of carbon dioxide an organization of Intergovernmental Panel on Climate Change (IPCC) was created in 1988 by United Nations Environment Program (UNEP). The IPCC released several reports based upon anthropogenic causes of climate change and their impacts. According to IPCC, 2007 report on climate change during the last 100 years the earth’s average temperature has increased up to 0.6 degree Celsius and if emission of greenhouse gases particularly carbon dioxide continues to rise, global temperature will rise up to 5.8 degrees Celsius by the end of 2100 AD.
    [Show full text]