“5. The current warming is accompanied by an increase of greenhouse gases in the atmosphere: water vapour is dominant among them, and in smaller quantities there are carbon dioxide, methane, nitrogen oxides and ozone. This has always happened because it is an occurrence that accompanies cyclical warming and cooling. The periodic increase in the number of greenhouse gases in the atmosphere, sometimes a value even several times larger than at present, has accompanied previous warming even before man inhabited the Earth.
6. Over the past 400 thousand years – even without human intervention – the level of CO2 in the air, based on the Antarctic ice cores, has already been similar 4 times, and even higher than the current value. At the end of the last ice age, within a time of a few hundred years, the average annual temperature changed over the globe several times, in total, it has gone up by almost 10 °C in the northern hemisphere, therefore the changes mentioned above were incomparably more dramatic than the changes reported today.
7. After a warm period in the past millennium, by the end of the thirteenth century, a cold period had begun and it lasted up to the mid-nineteenth century, and then a warm period in which we are living had begun. The phenomenon observed today, in particular the temporary rise of global temperature, are the result of the natural rhythm of climate change. Warmer and warmer oceans have a smaller ability to absorb carbon dioxide, and reducing the area of the long term permafrost leads to more rapid decomposition of organic compounds in the soil, and thus to increased emissions of greenhouse gases. …
8. A detailed monitoring of climate parameters has been carried out for slightly over 200 years; it only regards parts of continents, which constitute only 28% of the world. Some of the older measuring stations established – as a result of progressive urbanization, in the peripheries of the cities, are now within them. This factor, among other things, is the reason for the rise of the measured values of temperature. The research of the vast areas of the oceans has only been launched 40 years ago. Measurements taken for this kind of short periods of time can not be considered as a firm basis for creating fully reliable models of thermal changes on the surface of the Earth, and their accuracy is difficult to verify. That is why far-reaching restraint needs to be kept regarding blaming, or even giving the biggest credit to man for the increased level of emissions of greenhouse gases, for such a theory has not been proven.” CCNet April 24