Does human emission of CO2 cause global warming?
This is a scientific question and can be answered using the scientific method with observed global mean temperature data.
A graph of global mean temperature from the Climate Research Unit of the University of East Anglia is shown in the above graph .
The first period is from 1910 to 1940 & the second period is 60-years latter from 1970 to 2000. After human emission of CO2 for 60-years, the rate of change of global mean temperature of 0.15 deg C per decade from 1970 to 2000 is nearly identical to that of 0.16 deg C per decade from 1910 to 1940. That is, after a 5-times increase in human emission of CO2, there was no increase in the rate of increase of global mean temperature. This data contradicts the theory that human emission of CO2 causes global warming.
In addition, the data shows that the pattern of the global mean temperature is cyclic as shown in the following graph.
This graph shows the following:
1) 30-years of global cooling from 1880 to 1910.
2) 30-years of global warming from 1910 to 1940.
3) 30-years of global cooling from 1940 to 1970.
4) 30-years of global warming from 1970 to 2000.
Based on the above pattern, assuming there is no shift in climate in the coming 20 years compared to the last 130 years, it is reasonable to predict:
5) 30-years of global cooling from 2000 to 2030.
If this prediction is realized then the cyclic nature of global mean temperature will be confirmed. Otherwise, it will be rejected. This will be clear just in the next five to ten years.
If this cyclic nature of global mean temperature is confirmed, this will disprove man made global warming.