Is the Earth really cooling?

Enter your search terms

Web ClimateCooling.org Submit search form

Study of the orbital mechanics of the solar system in the 1970s led Russians to believe the Earth was about to cool and we should prepare quickly because it will be catastrophic. Their arguments were lost in the rush to warming group-think in the 1990s, but the arguments for impending cold are well founded and still believed by many good scientists. As the sun goes even quieter and January, 2008 saw the greatest year to year temperature drop ever (128 years of NASA GISS data) and thru the end of 2008 remains relatively cool, it is clear cooling needs to be considered as a very plausible future.  This is highlighted by 2 papers published in March 2008. Scafetta and West showed that up to 69% of observed warming is from the sun and remind us that the sun is projected to cool and Ramanathan and Carmichael show that soot has 60% of the warming power of CO2. Both papers state that these factors are underappreciated by IPCC. The soot may well explain the Arctic melting, as it has recently for Asian glaciers. Many scientists believe the temperature changes are more dependent on the sun than CO2, similar to the relationship in your home with your furnace.   With the Sun's face nearly quiet, the monthly patterns over the last 12 months are most similar to those of 1797 preceding the Dalton Minimum of 1798-1823 during the little ice age (Timo Niroma).

The southern hemisphere has been cooling over the last 10 years, just about as much as the north has been warming. There is no proof within observational data of warming outside of natural variation.  When 3 of the highest 5 or 6 years in the temperature record (since 1890) occurred over 70 years ago and 1900 was warmer than recent years in the USA (where the best data are), we are nowhere near statistical proof, nor even evidence of warming. Modelers are still unable to include important variables and no one is able to predict the future. At least Hadley Centre have tried (below). While CO2 continues to rise, the temperature has stabilized at a warm level, but not unusually so. Which way will it go? The world seems to be betting on warming. However, the probability of cooling may be equally valid and we must be prepared for both. Cooling presents the real danger. Things that go up and down only go so high. It has always been this way. Image of current northern sea ice (latest).  Check the S. hemisphere sea ice (latest).

Virtually all scientists agree that the Earth has warmed a small amount since the year 1000 or, if you choose, since 1850, when instrumented temperature records became reasonably accurate and distributed in key areas of the world. An alternative view, is that the Earth has been cooling since the 1930s when we had 3 of the 5 warmest years since 1860 in the US, and probably globally if the world environmental data base were cleaned up as is happening in the US. This site will be developed to show the science and the impacts related to global cooling, a very scary event compared to warming. It corresponds in the opposite way to the thousands of global warming sites.  An unbiased view is at our sister-site: Climate Change Facts. The Editor started his interest in climate change in the 1970s, charged with helping industry adapt to the certainty of global cooling. Tim Ball has documented the cooling trend and its implications.

Snow and ice in Bogota (photo), November 2007!! (Click)

And record cold in Buenos Aires - but "it can't be blamed on Global Warming"!! (Click)

There are still many solid scientists who think that the amount of warming is so small that it is indistinguishable from the noise in the environment data sets, and that the data have not been properly adjusted for such things as urban heat island effects, and instrument calibration. This is particularly true of the global data set, even though "urbanization has caused regional increases in temperature that exceed those measured on a global scale, leading to urban heat islands as much as 12°C hotter than their surroundings".   Also, it is generally accepted that the Earth has been much warmer than today, for example, in the time of the dinosaurs (the mid-cretaceous period) when the CO2 was 2 to 4 times greater than today (NOAA). More recently, in the prior period between ice ages, just 125,000 years ago, the Earth also was much warmer than today and the sea level much higher - by about 13 to 20 feet (4 to 6 meters) (IPCC). The primary driver of the past climate shifts is believed to be orbital mechanics and solar variability, with some contribution from Earth geophysical processes, such as volcanic eruptions. It is also known that mankind's contribution to CO2 is just a small percent of the total amount. Lastly, we know that the Earth's temperature and the level of CO2 rise and fall roughly together, but it is not clear (not proven) whether this is cause and effect by either variable. In a first attempt to use a CO2 - based model to predict temperatures, the results are not impressive at all and are exactly opposite observations.

Despite what the newspapers say, the cause of the temperature rise, and therefore the future course, is settled only within the consensus group of scientists. This is based on work of computer modelers, believing their increasingly complex models show the cause is due to man's activities and that there will be increasing temperatures according to how much additional greenhouse gases are emitted. There are many other scientists who are non-modelers, many with backgrounds as atmospheric physicists, climatologists, engineers, meteorologists, and paleo-climatologists, who do not believe the primary cause is mankind, although this could be part of it. Most of these scientists believe that the sun is at the root of the warming (if any), but that other factors are also at work. To help separate fact from fiction, an explanation of these thoughts is included here, along with links to these materials.

The chart below is from the Climatic Research Unit (CRU) at the University of East Anglia, which is well respected for its historical databases maintained at the global level, and which are used in IPCC assessments. See the Hadley composite charts for 1860 to present by month, year and quarter by hemisphere. Note that "global" warming is greatest in the Northern hemisphere. Links to similar charts, but all slightly different with different assumptions or algorithms to fill in missing or sparse data, are provided in the left margin below. The Japan Met. Agency (JMA) site is recommended because it is interactive and allows you to query the data base. For example, go to the JMA site and try different months, such as August and September. This will confirm the IPCC models that predict more warming will occur during the winter months than the summer. We don't know if this true.

This chart looks ominous until put into the context that the average temperature for 1901-2000 is 13.9C (57.0F), so we are talking about a change from about 13.5 to 14.3 C or 56.3 to 57. 7 F. Scientifically, we should use absolute temperatures, which would add an additional 273 C (460 F) degrees. In this context the increase is about 0.3 % Note on the chart that this premier data set puts the observed global warming at 0.42 deg. C (0.8 deg F) above the mean. As seen below, this increase since the mid 1800s is similar to that since the year 1000, although IPCC says the present temperature is likely higher. Greenland ice cores indicate that the start of the instrumented data (thermometers) coincides with a cold period in the northern hemisphere and that at the site of a well-studied ice core (Global Cooling-Doomsday Called Off), the temperature in the mid 1800s was the coldest in 8,000 years.

The Global Data are a Mess.

For the USA, the trend is less pronounced. Three of the 5 warmest years occurred about 80 years ago and 1900 was warmer than many recent years. NOAA/NCDC revised data on May 1, 2007 and NASA did so in August 2007. Per NOAA: This new data set uses mostly rural data and algorithms are used to identify and correct extraneous factors such as urban heat island effects. NOAA: "U.S. and global annual temperatures are now approximately 1.0°F warmer than at the start of the 20th century, and the rate of warming has accelerated over the past 30 years, increasing globally since the mid-1970's at a rate approximately three times faster than the century-scale trend. However, we are still cooler than in the 1930s and several recent years are below 1900.   Comment: The use of this new NOAA data set has dropped the temperature increase to 1.0 deg. F (.56 C) from the "improved data set of 2005" which had yielded a rise of 1.12 F. NOAA also says: The global annual temperature for combined land and ocean surfaces in 2006 was +0.54°C (+0.97°F) above average. But in the most recent data NOAA NCDC: "For the contiguous United States, the average temperature for October was 54.5°F (12.5°C), which was 0.3°F (0.2°C) below the 20th century mean, and ranked as the 44th coolest October on record, based on preliminary data." The NASA GISS chart of US data is shown. Our view: It is not clear this is worth getting excited about, given that the benefits of warming likely exceed the detriments and that this rise may be a data artifact, or a mostly natural variation. We believe if the global data set were given equal scrutiny to the US set, global warming would either vanish or be barely detectable. Russian Academicians believe major cooling is imminent.  The January 2009 PRAVDA ice-age article is likely vetted by them and the IPCC co-chair.

As the number of stations (often rural) has fallen the temperature has risen in an inverse relationship, suggesting the Urban Heat Island effect is the key component of any rise.

• CO2 (the most important gas) has risen from 280 ppm to 379 since pre-industrial times and its growth seems to be accelerating. Whether it does or not is the basis for 7 assumptions about future temperatures.
• Temperature increase. For the next 2 decades, 0.2 deg. C (0.4 F) temperature rise per decade, slightly higher later in most models. The models are all different and respond differently to different assumptions. For the end of this century, IPCC provides 7 best estimates (for 7 assumptions) ranging from 0.6 - 4.0 C (1.1-7.2 F). Warming is likely to lie in the range 2-4.5 deg. C (3.6-8.1 F), with a most likely value of about 3 deg. C (5.4 F). Since the 1800s the temperature has risen 0.76 deg.C (1.4 F). The warming is to be greater on land, in high northern latitudes.
• Sea level rise. For 6 sets of assumptions, the mid-points are about 0.3 meters ( 1 ft.) Since 1850 sea level has risen about 200 mm (9 in.), a little less than 2 mm/yr. More recently the rate appears to be 3.1 mm/yr, now measured by altimetry satellites. (However, we learned on 22 June 2007 that the data were manipulated to achieve this!!)
• Other attributes. Ocean acidity should rise with reduced ph units of 0.14 to 0.35; hurricanes become more intense, perhaps less numerous; heat waves and heavy precipitation more frequent; less sea ice and snow cover; higher westerly winds in mid-latitudes; more precipitation in high latitudes, less in sub-tropics inland areas.

• Discussions of increased summer heat waves and deaths should also include the reductions of winter cold waves and hypothermia deaths.
• Increased costs of home air conditioning need to be discussed in the same context as reduced heating costs.
• Increased mismatches between food availability in ecosystems need to also include reduced energy demands needed to maintain body temperature, such as for marine mammals.
• Discussions of coral reef bleaching need to include the expansion of coral reef habitats.
• Discussions of agriculture problems such as regional droughts and the need to change crops must include the expansion of production areas, general increased precipitation, and CO2 fertilization.
• Discussions of poison ivy becoming more prolific should similarly treat agricultural crops and forests.

• CO2 has usually been associated with temperature rise throughout the history of the Earth. It is indeed a greenhouse gas but it operates on a logarithmic function. The Earth's natural processes also contribute, and remove, copious amounts of CO2. Since plants first appeared on the Earth, they have converted nearly all available CO2 to oxygen, fossil fuels, and other longterm removals from the atmosphere. Today less than 4/100 of 1% (379 ppm) of our atmosphere is CO2. This pales in comparison with other periods in Earth's history. Common IPCC scenarios rely on an increasing supply of fossil fuels, yet we know that this is not possible and that production will soon peak (if not already) while prices will continue to rise. It is absolutely unrealistic to think CO2 emissions will rise for the duration of this century.
• The projected temperature rise is unrealistic, given that the USA and global temperatures have risen by only 1 deg F (.5 C) in 100 years (revised, NOAA, 1 May 2007 ), (or 150 years using the full instrumented data set) during the height of industrial expansion. Even if all this rise is correct, and is attributable to human causes, it is a trivial amount in the natural variation of the Earth, and to suggest the rise would accelerate 5 fold (IPCC best estimate) in this century is incredible. Even after the release of the new data set and procedures by NOAA on May 1, which addressed some of the urban heat island issues and dropped the warming 44% (below IPCC 2007), significant other urban heat island issues still remain. There are also issues of calibration as measurement protocols have changed, issues about the design and placement of the temperature stations, and even the strongly held view by many skeptics that this is a natural rise as the Earth recovers from the Little Ice Age (circa 1500-1900).
• Sea level rise may have increased recently, but other studies have consistently shown no increase. Even if there is an increase, it is in the order of 1 mm per year on top of the 1-2 mm per year that  has been happening for the last century, this additional amount is 4 inches (10 cm) over the century. This is not trivial if you are in a low-lying region wrestling with land subsidence, but it is barely more than what would be coming anyway.
• The other forecasts, such as for hurricanes, rainfall, and snow cover, are not significantly different than under natural variability, and will advance more slowly than the decadal oscillations. In particular, if ocean acidity were a problem for shell formation, it would have shown up already in areas where there are naturally high levels of CO2. It has not. Further, the lead hurricane expert for IPCC, Chris Landsea, resigned over the misrepresentation of data by IPCC

• Should not commit to actions that put us at a disadvantage, whether it is the Kyoto protocol or some other vehicle Increase our taxes on fuels (e.g., a carbon tax) that are inputs to production and services. If a taxing regime is implemented it must separate production uses from consumption.
• Should not forget that the most valuable things we have are our health, our lives, and our family, and place them at risk by driving, or riding in, vehicles that put them at risk in order to save energy or other costs. If there are larger vehicles where you drive, don't get priorities confused.
• Should not stop breathing even though it would be one of the most immediate steps to slow CO2 emissions.
• Should not do things without thinking. There are many ideas that may not have merit. For example, buying local vegetables to reduce transportation costs may actually increase energy use if the far off producer is a more efficient, and this is likely, if its costs are lower even after getting its goods to the local market. Another example is in using biofuels that have a high fossil energy input in fertilizer or machinery, or planting trees to reduce CO2, but finding out they also absorb solar radiation more than what they replace.

• Reliance on Computer Models. The sophistication of computer models has advanced steadily over the past few years, to the point that many scientists believe the models are able to forecast future changes in climate. Other scientists believe that the outputs, while interesting, do not match the reality of what happened in prior periods of the Earth's history when the temperature was higher and the CO2 levels 2 to 20 times higher than today. Most also believe the Earth system is far too complex, with too many unknown drivers and feedbacks, to enable use of models. One example is the El Niño phenomenon, which is not reliably modeled after decades of study. Another is that there are indications that the models are wrong in the drought predictions in the tropics and subtropics. Paleo data shows that deserts were wetter during prior warm periods and a May, 2007 paper in Nature points out that there is a ~6.5% rise in precip per deg C, while the models only use 1-3%, an error of 3X! in results. This explains better the satellite obs of a greener, wetter Earth (NASA). The models cannot be initialized to current conditions and are unable to correctly incorporate the major decadal scale vents such as the NAO and the PDO, that control our climate in the northern hemisphere (Dr. Kevin Trenberth, IPCC Author).
• Computer models are too coarse. Everyone knows the models should have finer resolution, but there are computational constraints and staffing constraints to develop models at the regional or even local scale. The skeptics argue that this is part of the overstating of impacts. for example. a mountainous area the size of a large country may have an average height that is barely above sea level. The rain-producing mountains that intercept sea-breezes do not exist in the model and the result of the simulation understates future rainfall for the region. There is also a problem in the use of average temperatures in that they do not capture the difference in density and humidity.
• The models do not seem correct. The warming of the ocean, the warming of the land, the rise of sea level are all coming in below projections, while much more rain is falling, as the time series grows and even as the models are "adjusted" to reflect the observations, casting their basic premises into doubt. On 22 June, 2007 (Dr. Nils-Axel Mörner) we learned that data were manipulated to create an acceleration in sea level rise. Warming should be detected through an acceleration in the rate of rise and that rise should slow the Earth's rotation. Neither  has  occurred.
• Attribution of the warming trend to human activities. The consensus scientists believe their models can replicate reasonably enough the contribution of human-caused greenhouse gases and thus they can be used to estimate future warming. The other scientists believe this is not the case. The reasons vary among the scientists, but the most common ones are: CO2, the target gas, pales in its abilities to impact temperature compared to water vapor and solar variability (not just radiation but also magnetic flux (which controls cosmic radiation and cloudiness) and orbital mechanics). Some scientists believe that CO2 is actually a cooling gas and we need to look elsewhere. Additional factors that some skeptics believe are not adequately considered are the natural contributions of CO2 and other gases that dwarf the human component and the impact of cosmic radiation on the formation of clouds. Also, it is not clear to some scientists whether CO2 increases lead to warming or whether warming leads to CO2 increases. To many skeptics, the over valuation of CO2 as a causative agent, particularly in light of it having a logarithmic function that decreases impact with the amount of CO2, is an indication of a policy agenda meant to deter the use of fossil fuels, not understand climate change.
• This warming may be natural variability. While most scientists believe that the observed warming is real, some believe that it is so slight that we can't be sure that instrument calibration problems and urban heat island impacts have been dealt with adequately. If not, it has not been for lack of effort. The problems are immense. For example, in 1999, Los Angeles moved its data station 4 miles to an area outside the city that is lower in elevation and nearer the coast, with cooler, drier, and less extreme conditions. Even when a location has not moved, the rising temperatures may reflect the growth of a community, or land use changes, around it. Calibration is daunting for calibrating the instruments themselves. An example is relating sea surface temperatures that were derived from a thermometer placed in a bucket of water pulled from the ocean in 1860, with a continuous stream of data taken from a ship's water inlet much deeper in the water in the 1960s, data from drifting and moored buoys transmitted by satellite in the 1980s, and with satellite data from the very top layer of the surface since the 1970s. Perhaps only time will really tell. Many skeptic scientists believe that the trend line turned in 1998 for the present cycle, while many consensus scientists are quick to point out that we are still having temperatures above average, and in turn, the skeptics claim that there is no real way to compute a global average. Lastly, the best data are from the USA. According to NOAA, 2006 was the warmest year in U.S. records, almost the same as 1936. The skeptics say that if only rural sites are used, the temperature actually falls, indicating that in the US, and probably the world, what has been measured is the growth of cities and the heat they absorb and generate; there is no warming.
• This warming is largely recovery from the Little Ice Age. The natural rate of increase of about 1 deg F (0.5 C) since the LIA (~1500-1900) has not been removed from the IPCC estimations of temperature rise. The CO2 contribution is negligible or non-existent because there is no credible way to compensate for the sharp cooling from 1940 to the 1970s in the face of the rapid growth of CO2, nor the similar (to present) rise from 1920 to 1940 in the absence of rapid CO2 growth. See for example, Is the Earth still recovering from the “Little Ice Age”?: A possible cause of global warming by Syun-Ichi Akasofu (7 May 2007) . Another difficulty with accepting the temperature rise at face value is the evidence that the start of the use of thermometers in about 1850 comes at the same time as the emergence from the coldest period in 8,000 years.
• The rate of warming is dangerous. Not so, say the skeptics, pointing out that the rate of warming from 1980 to 1998 has been seen before, and for many parts of the Earth such temperature changes are recurrent, such as when the Atlantic and Pacific and ENSO (el Niño) oscillations change state, causing immediate massive changes in ocean environments of fish, corals, and marine mammals.
• Sensationalist press not counteracted. The fact that Antarctica is warming in the area nearest Chile gets heralded, but the IPCC science documents show that, as a whole, Antarctica is stable. Flooding of coasts and cities, attributed to warming, is not countered by the IPCC, even though its science document shows no discernible acceleration in the rate of rise, a solid indicator of warming and necessary for prior sea level projections.
• Warming Impacts. Many scientists in the consensus group believe that the IPCC estimates of temperature rise are accurate and the impact from these changes will be bad for the Earth, its ecosystems, and its people. Other scientists, even if accepting the IPCC forecasts, believe that the Earth was warmer before and with higher CO2 levels and that these were among the most ecologically productive periods in terms of speciation and biomass. This contrasts sharply with periods of glaciation, the ice ages, that come and go whether humans have any influence or not. A case in point is my testimony which shows the paleo record tells us that corals were very expansive when the Earth was warmer and CO2 much higher, whereas 3 other scientists testified that corals were in grave danger, even now, due to the high temperatures and acidification of the ocean caused by CO2.
• An Average Wrong Answer. The IPCC reliance on emission scenarios, and then presenting all the outputs of temperature rise and impacts as if they had somewhat equal probability, leads to an average wrong answer and exaggerated impact assessments.
• Influence of the Sun. Scientists affiliated with the Consensus believe solar influences are not important to the recent warming and that are actually in the wrong direction (See recent paper by Lockwood and Frohlich).  Other scientists believe that the analysis is flawed and that the actual mechanisms through which the Sun affects Earth climate were not used in the analysis (for example, Whitehouse). Solar mechanisms, not used in climate models, include several cycles of a few to hundreds of years.  When superimposed, they have profound warming or cooling effects.

• Very Few Scientists. Few scientists are actually involved in writing the materials, perhaps a few dozen. Usually there is one real leader, a Chair or Co-Chair and 2 or 3 titular co-chairs that often are present to provide balance for the developing nations. Because of skill or language barriers they may not be greatly involved. Lead Authors are usually involved in just one piece of the section or chapter. These few people, depending on the breadth of the chapter, prepare the first and subsequent drafts and the Executive Summary that feeds into the SPM, long before the draft chapters have been through national reviews. Even here, the Co-Chairs decide which inputs are to be accepted, or make recommendations that usually are sustained, during plenary sessions. Yes, thousands of scientists review the IPCC documents, but usually only those parts that impinge on their own expertise, which is usually quite narrow.
• Overstatement of Risks and Impacts. We know from the paleo record that the Earth routinely goes through climate swings greater than IPCC projects, yet IPCC does not go far enough in correcting overstatements in its own documents and in those of the press. There will be winners and losers, but always we hear only of the losses. Balance is missing.  Things will be different, but not necessarily worse. For example, sea level rise has been happening since the end of the last ice age, and there is little evidence of any significant acceleration, yet most people believe that global warming will flood all coastal areas. The areas may flood, just as Georges Bank is now deep beneath the Atlantic, if this unusually long period in between ice ages continues and we see warmth as great as the last interglacial, but flooding won't be caused by human-derived warming, although it may contribute. Another example is the great numbers of reports about Antarctica warming, yet the latest IPCC document shows that there is no evidence of any change in temperature or ice coverage.
• Too Many People are Excluded or Their Input not Valued. This includes astronomers and geologists. Some times the exclusion is real or just perceived. Over time this tends to make the inside group of IPCC scientists more uniform in their beliefs while adding to the anti-IPCC consensus.
• Pressure is Placed on People Who Disagree with the IPCC Majority. This is evidenced by the attempted removal of at least 4 US state climatologists whose Governors have decided that conformance to the consensus view is required. The Policy Statement of their Association states that the natural variability in the climate system is very strong, that we lack the ability to predict greater than about 10 years into the future, and it is essential to collect data necessary to know if the climate is changing.
• The process leading to the Summary for Policy Makers (SPM) is too Political. The Skeptics have more trouble with the SPM than the underlying reports. It is not too affectionately called "SPAM". Even though the Scientists are present during finalization, and have sufficient authority to make sure they can live with it, many of the national delegations work to accomplish their policy objectives through the report. Some Skeptics have responded by developing an Independent SPM, based on the same underlying IPCC science documents, but with very different interpretations. An excellent report by the Earth Negotiations Bulletin sheds light on the process.  It is recommended reading. An excerpt follows from their report of the approval meeting of the IPCC SPM for WG1 (2007):

   

• On Somebody's Payroll. Many press articles have been written to say that scientists who disagree do so because they are being supported by oil companies or some other group with a stake in the outcome. The counter argument is that most consensus scientists have funding derived from government or university sources that are directly based on public concern and fear. It is most likely that nearly all scientists say and write that which they do because they believe it to be true. Money, whether a Federal grant, or a corporate grant, will flow to support an avenue of inquiry believed in the grantor's interest. Science is not bought in advance (usually).
• Not Mainstream Scientists. The skeptics are discredited often by allegations that they are not doing work that is germane to the climate change work, or that they are inexperienced. The countering allegation is that since one or more of any reviewers for the main scientific journals are likely to be members of the consensus, any work showing the consensus view is wrong cannot be published in a primary journal. One fact is that many of the mainline skeptics are full professors involved in climate research at major universities.
• Disproportionate Press Coverage. Consensus scientists and their allies decry all the attention the Skeptics get, when they are so few. Perhaps they are perceived to be so few because Consensus people do not see them in the room and do not realize how numerous they are becoming. Conversely the Skeptics have reached critical mass and, not seeing any consensus members in their own midst, see themselves as the true consensus. Of course, the press loves a controversy. It, along with fear, are two primary attributes that expand the audience. If anyone believes the Skeptics are some tiny minority, try using your favorite search engine to search for climate skeptics. The search will show dozens or hundreds of pro and con Skeptic arguments and websites. It will show some of the hype and hysteria on all sides of the climate arguments, as well as legitimate scientific sites and discussion forums.