FORMERLY GLOBAL WARMING
And prior to that... GLOBAL COOLING
I remember in 1973 the media informed us that scientists confirmed all known and
projected oil and gas reserves worldwide would last only 10 years... or if we were particularly
careful we might make it 15 years. This "scientific fact" was repeated constantly
on the radio, on TV, and in newspapers and magazines. They informed us that after
that time there would be no oil and gas left in the entire world. Very alarming stuff!
In response, governments reduced the speed limits to "help" (force) us to conserve.
Prices sky rocketed. We were told that all leading scientists were in agreement
on this "fact." It's easy to see in 2012 that they got it wrong!
Then, as early as 1975, we were warned about imminent global cooling (see The "Cooling World,"
Newsweek, April 28, 1975). In the 1980's, the media assured us that "leading scientists" were all
in agreement that manufacturing produced gasses that were causing global
cooling. (Naturally, WE were causing the cooling through manufacturing. No one seemed
to consider natural fluctuation.) The media warned us that a return to the ice ages was imminent. Movies
were made exploring global cooling and how it would affect us.
For a while I didn't hear much about pollution and its effect on global temperature.
Time passed and again I started hearing about carbon dioxide causing the climate to change.
But this time we were told that the carbon dioxide was causing global warming.
The media assured us that "leading scientists" were in agreement - global warming
was the latest threat to the world.
With the media's ignorance regarding world-wide oil reserves and their switch from global
cooling to global warming, I decided to look into global temperature change for myself!
First I looked over graphs depicting global temperatures. Some graphs covered
only the last thousand years. Others covered 100's of millions of years. The first
thing I realized is that we are currently in one of the earth's major ice ages
which began almost two million years ago. Prior to this ice age, the average
global temperature was about 7 degrees Celsius warmer than it currently is today.
We live in what is called the Holocene interglacial, which is the seventh
interglacial in our current ice age, the Quaternary. We live in Earth’s fourth or
fifth ice age (there is some disagreement which). The current ice age is still
relatively young – only about 2.58 million years old. The preceding ice ages
differ in length between 30 million and 300 million years.
The Holocene is, by some, considered the seventh interglacial of this current ice
age. However, I've seen as many as twenty interglacials listed for this ice age.
So it can be said that we are living in the seventh interglacial of the fourth
ice age. The Holocene interglacial is only a tiny sliver of time compared to
the 4.5 billion years of Earth’s existence. Without the warm climate of our
Holocene interglacial there would be no history of human civilization to look
Surface temperature has not consistently risen at the rate predicted by simple greenhouse
warming. While global temperatures have been relatively high over the past
fifteen years, they have also been relatively stable. In addition, prior to assigning
any temperature changes to man made causes, one must first subtract the changes produced
by natural global temperature change mechanisms.
"Ice age" can mean two different things. It can refer to the four prolonged
periods of generalized global cooling (as seen in the graph above)
or perhaps more commonly, within an ice age it can refer to glaciations between
the short warming periods called interglacials. This understanding helped me
realize that the earlier "ice age" that "ended" about 10 thousand years ago was
really part of a cycle of global cooling and warming within our current two
million year ice age. While the earth warms withing the interglacials, the earth's
temperature is always well below the "normal" temperature outside the ice ages.
Therefore, even the hottest interglacial temperature is well below the earth's
average non-ice age temperature.
During the present ice age, glaciers have advanced and retreated between 7 to 20 times,
(depending on how the estimation was performed) often blanketing North America
with ice. Our climate today is actually a warm
interval between these many periods of glaciation. The most recent period of
glaciation, which many people think of as the "Ice Age", was at its height
approximately 20,000 years ago.
Therefore, we are in one of the more than 20 warming cycles within the current two million year
ice age. The warming cycles are called interglacials (between the glaciers).
The scary thing to me is that we are nearing the the highest temperatures seen
in the earlier interglacials within this two million year ice age. That means that
we are soon (soon in geological time) due for a cool down to return the temperature
to ice age norms, which is about four to five degrees Celcius cooler than our
current temperature. (My guess is that this fact is what got the scientists
predicting global cooling in the 1980's.)
As you can see in the following graph, the Eemian interglacial, the interglacial
that occurred just before our present interglacial, reached about 2 degrees
Celcius warmer than our current temperature. The Eemian interglacial was warmer
than our present interglacial without any "man-made global warming." Why is this
uncontested fact not mentioned when global warming is being discussed?
Of couse, we could get even warmer for
a while longer before the cool down, or we might be coming out of the ice age
altogether. In that case the earth will be getting much much warmer!
Sadly, the earth's average temperature has been much much warmer for more than half of its
existance so this great increase in temperature is a possibility.
The Holocene Interglacial is our most recent period between glaciations. The
period of receding glaciation preceding the Holocene Interglacial is the Eemian Interglacial,
which began 130 thousand years BP (Before Present). The warmest temperature in the Eemian
Interglacial was 1 to 2 degrees Centigrade higher than our current Holocene Interglacial
temperature (1 to 2 degrees warmer than now). During the Eemian Stage sea level
was about 8 meters (24 feet) higher than today and the water temperature of the North Sea
was 2°C higher than at present. The Eemian Interglacial lasted about 16,000 years.
We certainly didn't cause the global warming of the Eemian!
The four pictures show the progression of glaciation. At the height of the Eemian
there is virtually no glaciation. As the temperature dropped, glaciation increased.
During the glaciation period prior to the Eemian the glacier was determined to be
1,000 feet thick and progressed as far south as the Northeastern corner of Kansas!
Warming interglacials have lasted, on average, about ten thousand years before
the world's temperature returns to a colder climate. The current interglacial
is the holocene interglacial. The holocene interglacial has already lasted about
ten thousand years.
You will note that the earth's present temperature is in the range of earth's temperature
during 1000 AD to 1350 AD. I've never heard this fact mentioned in media reports?
Until recently, temperature changes clearly had nothing to do with man made
factors. Therefore, any valid discussion of man made contributions to temperature
change MUST include a discussion of the natural and cyclic factors involved in world wide
temperature change and the factors contributing to those natural temperature changes.
So far a discussion in these natural factors has been completely absent, making me
question the scientific reliability of all of these so called "scientific" global
The maximum cold in the preceding glacial period was approximately 23,000 to 15,000
years ago with ice caps approximately one mile thick and the sea level about 350
feet below present levels. There was also a worldwide increase in atmospheric dust.
Recent paleodata have revealed that there were abrupt transitions in climate in which
major shifts in some components of the earth's climate are accomplished on time scales
of a decade or less! Greenland ice cores suggest changes took place in between
five to ten years!
You can see in the graph, above, that the temperature 18,000 years ago (at the beginning of
the Holocene Interglacial) was about four degrees Centigrade colder than our
current average temperature. Note that somewhere between 18,000 and 14,000
years ago the last "ice age" (glaciation) was ending and we were entering
our current interglacial period. You can see that, as always, the temperature
fluctuates throughout its cycle, both rising and falling!
See the abrupt drop in temperature at about 10,500 Before Present and the abrupt rise in
temperature about 10,000 Before Present. The rise was about 2 1/2 degrees Celcius
in a very few years and the drop was abrupt and significant. The amount of change in
the last 100 years is negligible compared to the natural change seen then!
We can see that the temperature exceeded current levels not only between 750 - 2000
years before present but also 4,000 - 7000 years ago and 8,500 to 9,500 years ago.years!
We cannot credit man made global warming for ANY of those time periods in which the
earth's temperature exceeded current levels!
Other sources have time frames for the warming and cooling
periods in the Holocene that, while similar in overall pattern, vary a bit on the
exact dates. The closer to the present we come the greater all sources are in
agreement. For example, from the Roman period continuing to the present,
climate intervals are stated as residing near the following dates:
The Roman Warming (250 BC—450 AD)
The Dark Ages (535–900 AD)
The Medieval Warming (900–1300 AD)
The Little Ice Age (1280–1850 AD)
The Late 20th Century Warming (1850 AD to the present)
These sources state that during both the Roman Warming and the Medieval Warming,
global temperatures were actually higher than current global temperatures.
They also note that during both the Dark Ages and the Little Ice Age, global
temperatures were lower than they are currently. (I've never seen or
heard an advocate of man made global warming discuss these rather dramatic world
wide temperature fluctuations and how the contribution of earth's
natural temperature fluctuations were removed from the calculation to determine
that man is dramatically affecting our current world wide temperature! No assertion
that world wide temperature changes are caused by man can be considered valid
until the mechanism by which natural fluctuation was removed from the equation has
been clearly provided and proven reliable.)
They also note that during the Late 20th Century Warming, the Earth's temperature
began to recover (rise) from the long “Little Ice Age.” Of course, this period
wasn’t actually an ice age. It was a less warm period during the current interglacial.
Many who support the idea that the earth is warming say this is due to increasing
levels of CO2 in the atmosphere. During the last period of glaciation the atmospheric CO2
content was much lower than today, about 190 ppmv. By the beginning of the
Holocene, atmospheric CO2 had risen to approximately 250 ppmv. In the last 8,000
years atmospheric CO2 increased to its current 391 ppmv. Although Global
temperatures during the Roman Warming were higher than today, the atmospheric CO2
content was lower. This fact alone disproves the claim of man-made global warming
advocates who claim that CO2 is the main climate driver.
Global Warming is now called Global Temperature Change, which is a safer
designation because global temperature ALWAYS changes. However, I have yet
to see a Global Warming prediction (Global Temperature Change prediction) that
includes an explanation of how NATURAL GLOBAL TEMPERATURE FLUCTUATIONS were taken
into account AND ELIMINATED WHEN MAKING THE GLOBAL TEMPERATURE CHANGE PREDICTION!
ANY VALID ASSERTIONS REGARDING MAN MADE TEMPERATURE CHANGES MUST INCLUDE THE METHOD
USED TO TAKE INTO ACCOUNT AND ELIMINATE NATURAL GLOBAL TEMPERATURE FLUCTUATIONS!
ASSERTIONS THAT LACK INFORMATION REGARDING THE METHOD USED TO ELIMINATE NATURAL
GLOBAL TEMPERATURE FLUCTUATIONS ARE NOT VALID AND LACK SCIENTIFIC CREDIBILITY.
WHY IS SO MUCH TIME AND MONEY BEING SPENT TRYING TO PROVE GLOBAL WARMING IS MAN
MADE WITHOUT ANYONE ACTUALLY USING THE SCIENTIFIC METHOD TO DO SO?