The scientific and public debate on what causes global warming has been very one-sided.
The claim the so-called greenhouse gases (chiefly the natural biological products, carbon dioxide, methane and nitrous oxide) are the cause of global warming is only a theory.
It is not fact or an unequivocal truth, even though the proponents of the theory would want to claim the science behind their theory is beyond debate and supported by an overwhelming majority of scientists.
The reality is the scientists associated with climate change groupings represent only a small proportion of the total physical and biological scientists around the world, but collectively they have had an inordinately large influence on governments and policy makers.
In addition, they have adopted a condescending tactic to rebut criticism by disparaging or questioning the integrity or knowledge of those who oppose their point of view by labelling them deniers and sceptics and to claim the majority of scientists accept the so-called science of greenhouse gas-induced global warming.
The fact is there has been no poll among scientists concerning their beliefs and a large body of physical and biological scientists do not accept this theory (a recent scientific publication rejecting this theory had 10,000 signatories), as they believe the historic scientific record shows clearly the sun has always controlled and continues to control global temperature, not greenhouse gases.
Put simply, although very complex in reality, the earth's temperature balance is dictated by the net effects of energy into (solar irradiance), and energy out of (back radiation and heat loss), the earth's atmosphere and surface.
If energy in exceeds energy out the earth warms and if energy in is less than out the earth cools.
The greenhouse gas theory claims that increasing greenhouse gases restricts thermal energy out to the point that the energy balance is positively affected and therefore the earth warms.
The greenhouse gas theory of global warming, however, is only a very recent proposition in earth time, relating to the period of time since the industrial revolution.
It does not explain the reasons for the earth warming and cooling during the millennia of its existence.
The alternative point of view held by a very large number of scientists is that the variation in energy received from the sun has a much greater effect on global temperature balance than the effect of greenhouse gases on energy loss and therefore it is the sun's activity that has always dominantly controlled global warming and cooling. /more