Global warming is a cyclical event with each cycle spread across eons of time. However,
happenings over recent decades certainly indicate that the current rate of warming is more
because of influences attributable to human activity. The prognosis is that there is only a decade
in which to begin to reverse current trends before the trends become irreversible, and the truly
devastating consequences occurring after year 2100 would become inevitable.
James Hansen, director of the NASA Goddard Space Studies said in April, 2005:
"There can no longer be genuine doubt that human-made gases are the dominant cause of
The 2005 NASA Goddard Space Center study has shown that more of the sun's energy is being
absorbed than is being emitted back into space creating an "enhanced greenhouse effect"
warming the globe to an eventually harmful extent. The unique molecular structure of Greenhouse
gases (GHG) trap the sun's heat close to the earth's surface keeping the earth warm and
habitable. Without that GHG function the earth would be an average 60 degrees Fahrenheit colder
since the earth of itself has a temperature average of about 45 deg. F.
Levels of carbon dioxide in the atmosphere which had remained almost unchanged for at least ten
thousand years at some 280 parts per per million by volume, increased steadily since the Industrial
Revolution took hold in the year 1750. By 2007 the carbon dioxide level in the atmosphere had risen
to 384 parts per million by volume and appears to be increasing by about 2 parts per million
annually. The recent increases surge from time to time coincident with increased energy consumption
led by western nations during the World War II and since 1970.
The earth's polar ice caps over many era have trapped samples of the air in bubbles within
the ice. By drilling and analyzing ice core samples of past years of accumulation of ice scientists
are able to determine variations in the composition of GHG in the atmosphere over time.
This stunning graph derived from the scientific analysis of miles of ice cores drilled deep into
the World's ice caps reveals the shocking proof of increases in the most significant of
greenhouse gases carbon dioxideCommon gas found in the atmosphere. Has the ability to selectively absorb radiation in the longwave band. This absorption causes the greenhouse effect. The concentration of this gas has been steadily increasing in the atmosphere over the last three centuries due to the burning of fossil fuels, deforestation, and land-use change. Some scientists believe higher concentrations of carbon dioxide and other greenhouse gases will result in an enhancement of the greenhouse effect and global warming. The chemical formula for carbon dioxide is CO2. (CO2).
Never before in the history of the past 650,000 years has there been such a sharp rise, nor of such
an extent as that occurring in our time today.
What is also most remarkable is that the average temperatures plotted on the same scale, again
from evidence of the ice cores, shows the low and high temperatures coincide with the lows and highs
of the levels of the CO2 atmospheric levels. The graph below, first published in the
magazine Nature, portrays this very well. It can be argued which is causal, the heating or
the CO2 concentrations in the atmosphere, or that they may be inter-related and
exacerbate each other.
However, there is a difference in the horizontal and vertical scales to the graphs of which we
must be aware. The above graph dates from the year 1 AD; the graph below dates from BP which stands
for Before Present (a lateral shift of 2,000 years). Nevertheless, the title of the above is to the
year 2004, and the vertical line intercepts appropriately to the right of the year-0 mark on the
The matrix superimposed on the graph below can also be misleading in that it relates to the right
hand temperature scale and not to the left hand CO2 scale. Moreover, the right hand scale
has an upward shift such that the "0" of that scale is not aligned with level of 275 ppm
approximate to an average temperature corresponding with that level of CO2 concentration
in the atmosphere which keeps the earth comfortable for us to live here.
What is important to note, is that the lowest temperature levels during the last ice age (starting
about 130,000 years ago) would only be about 8 °C below today's average, and the maximum
level would be about a fraction of that higher (say, 1.6 °C higher).
Quoting from a 2002 report by the National Academy of Science:
Recent scientific evidence shows that major and widespread climate changes have occurred with
startling speed. For example, roughly half of the North Atlantic warming since the last ice age was
achieved in only a decade, and it was accompanied by significant climate changes across most of the
The effects of global warming seem to have a compounding effect with respect to time. A small
event stimulating a change of climate has accelerating unwelcome regional and global impacts.
What can have caused this phenomena? What can we do about it and what are the likely consequences
if nothing is done in the very short time before the effects become irreversible?
We must recognize that man probably had little to do with events prior to the end of the last
mini ice age ten thousand years ago.
A Note on Units used:
1 ton carbon, C = 3.67 tons of carbon dioxide, CO2, (carbon is the chosen metric, CO2,
is the gas)
1 billion tons carbon = 1 gigaton carbon = 1 Gt C
Concentration of CO2 = total stock of CO2, already in the atmosphere
Annual emissions of CO2 = the yearly new flow of CO2, into the
Until emissions fall to about one fifth of current levels, concentrations of CO2
continue to rise, with rising concentrations of CO2, the pace of global warming and
climate changes continue to accelerate.
- 2005 concentrations of CO2, in the atmosphere were 380 ppm (parts per million)
- 2025 concentrations of CO2, in the atmosphere are projected to be 420 — 430 ppm
- 2050 concentrations of CO2, in the atmosphere are projected to be 500 ppm
At 500+ ppm the irreversible trend is to melt the Greenland ice cap, raising sea levels by up to
Some help in forming an opinion on this subject is given in the items on
Impact on Florida,
and Possible Remedies.
Refer also to the Alternative Energy
page of this website.
To see a 14 minute video and links to other sites on this topic go to http://seastudios.org/ahead2_video_qt.php