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Myth 1: Global temperatures are rising at a rapid, unprecedented rate.

Fact: Accurate satellite, balloon and mountain top observations made over the last three decades have not shown any significant change in the long term rate of increase in global temperatures.

Average ground station readings do show a mild warming over the last 100 years, but well within the natural variations recorded in the last millennium. The ground station network suffers from an uneven distribution across the globe; the stations are preferentially located in growing urban and industrial areas ("heat islands") which show substantially higher readings than adjacent rural areas ("land use effects").

Myth 2: The "hockey stick" graph proves that the earth has experienced a steady, very gradual temperature increase for 1000 years, then recently began a sudden increase.

Fact: Significant changes in climate have continually occurred throughout geologic time. For instance, the Medieval Warm Period, from around 1000 to1200 AD (when the Vikings farmed on Greenland) was followed by a period known as the Little Ice Age. Since the end of the 17th Century the "average" global temperature has been rising at a rate of 0.6 to 0.8 degrees Celsius per 100 years; although from 1940–1970 temperatures actually dropped, leading to a Global Cooling scare. The "hockey stick", a poster boy of both the UN's IPCC and Canada's Environment Department, ignores historical recorded climatic swings, and has now also been proven to be flawed and statistically unreliable as well.

Myth 3: Human produced carbon dioxide has increased over the last 100 years, adding to the Greenhouse effect, thus warming the earth.

Fact: Carbon dioxide levels have indeed changed for various reasons, human and otherwise, just as they have throughout geologic time. The CO2 increase was only 0.4% over the last 50 years, rather than the 5% per 100 years quoted by Kyoto. However, as measured in ice cores dated over many thousands of years, CO2 levels move up and down AFTER the temperature has done so, and thus are the RESULT OF, NOT THE CAUSE of warming. Geological field work in recent sediments confirms this. There is solid evidence that as temperatures rise naturally and cyclically, the earth's oceans expel more CO2 as a result.

Myth 4: CO2 is the most common greenhouse gas.

Fact: Water vapour or clouds, which makes up on average about 3% of the atmosphere by volume, and — according to several researchers — about 60% by effect, is the major greenhouse gas. 97% of greenhouse gases are water vapour by volume. Moreover, because of its molecular weight and absorptive capacity, water vapour is 3000 times more effective than CO2 as a greenhouse gas. Those attributing climate change to CO2 rarely mention this important fact.

Myth 5: Computer models verify that CO2 increases will cause significant global warming.

Fact: Unfortunately, computer models predicting global warming are incapable of including the effects of the sun and the clouds. Further, the main cause of temperature variation is the sun. Its radiation changes all the time, partly in cyclical fashion. The number of sunspots can be correlated very closely with average temperatures on earth, e.g. the Little Ice Age and the Medieval Warm Period. Varying intensity of solar heat radiation affects the surface temperature of the oceans and the currents. Warmer ocean water expels gases, some of which is CO2.

Myth 6: The UN proved that man-made CO2 causes global warming.

Fact: In a 1996 report by the UN on global warming, two statements were deleted from the final draft. Here they are:

1) "None of the studies cited above has shown clear evidence that we can attribute the observed climate changes to increases in greenhouse gases."

2) "No study to date has positively attributed all or part of the climate change to....man-made causes."

There is simply no scientific proof that man-made CO2 causes significant global warming.

Myth 7: CO2 is a pollutant.

Fact: This is absolutely not true. Nitrogen forms 80% of our atmosphere. We could not live in 100% nitrogen either. Carbon dioxide is no more a pollutant than nitrogen is. However, CO2 is essential to life on earth. It is necessary for plant growth since increased CO2 intake as a result of increased atmospheric concentration causes many trees and other plants to grow more vigorously.

Myth 8: Global warming will cause more storms and other weather extremes.

Fact: There is no scientific or statistical evidence whatsoever that supports such claims. Growing insurance and infrastructure repair costs, particularly in coastal areas, are sometimes claimed to be the result of increasing frequency and severity of storms, whereas in reality they are a function of increasing population density, escalating development value, and ever more media reporting.

Myth 9: Receding glaciers and the calving of ice shelves are proof of global warming.

Fact: Glaciers have been receding and growing cyclically for hundreds of years. Recent glacier melting is a consequence of coming out of the very cool period of the Little Ice Age. Ice shelves have been breaking off for centuries. Scientists know of at least 33 periods of glaciers growing and then retreating.

It's normal.

Myth 10: The earth's poles are warming; polar ice caps are breaking up and melting and the sea level rising.

Fact: The earth is variable. The western Arctic may be getting somewhat warmer, due to unrelated cyclic events in the Pacific Ocean, but the Eastern Arctic and Greenland are getting colder. The small Palmer Peninsula of Antarctica is getting warmer, while the main Antarctic continent is actually cooling.

Hat tips: Varla, Byron.