In laboratory conditions, increases in the proportion of CO2 in air result in a small, but proportional increase in heat retention. It was reasonable to ask whether a similar effect might apply in the real world.
If increased CO2 was responsible for warming, then this warming would occur more quickly in the upper troposphere, and at the poles. This has not happened.
Most obviously, if human produced CO2 emissions had an effect on global climate, then there would be a correlation between changes in CO2 levels and changes in climate. No such correlation has been observed.
So we know, and have known for some years, that anthropogenic global warming theory is wrong.
Jennifer Marohasy has posted a discussion of the work of Hungarian physicist Ferenc Miskolczi which helps to clarify why it is wrong.
If more care had been taken with maths and research when the theory was first proposed, it would have been clear right from the start that it was wrong.
Some years ago this Hungarian physicist, then working for NASA, discovered a flaw in an equation used in the current climate models discovered a flaw in how those constructing the IPCC climate models deal with the issue of the atmosphere’s boundary conditions. In order to progress this research Dr Miskolczi eventually resigned from NASA claiming his supervisors at NASA tried to suppress discussion and publication of his findings which have since been published in IDŐJÁRÁS, The Quarterly Journal of the Hungarian Meteorological Service.
The key point:
.. the Earth’s atmosphere dynamically keeps its greenhouse effect right at its critical value, regardless of our continuing CO2 emissions, regardless of any change in atmospheric CO2 concentration in the past ten thousand years. Miskolczi’s dynamic constraint keeps the greenhouse effect “climatically saturated”: emitting CO2 into the air cannot increase the normalized greenhouse factor g because any impact of human addition of CO2 is dynamically countered by about 1% decrease of the main greenhouse gas, water vapor (moisture) in the atmosphere.
In other words, changes in ‘greenhouse gases’ do not affect the climate because any increase in CO2 or other heat retaining gas causes a corresponding and counter-balancing reduction in the concentration of the main greenhouse gas – water vapour.
Global climate can and does and will change. This has been and will continue to be primarily because of changes in the amount of heat and light received from the sun.