They cannot explain why we had a cooling period from 1940 to 1975, where essentially the same people who are warning of an existential threat of warming were warning of an existential threat that billions would die from an existential threat of a coming ice age.
The consistent pattern of the IPCC reveals demonization and misrepresentations of CO2. Here are some basic facts about CO2 that illustrate the discrepancy between what the IPCC claim and what science knows.
Natural levels of Carbon dioxide (CO2) are less than 0.04% of the total atmosphere; it is far from being the most important or even only greenhouse gas as most of the public understands.
Water vapour which is 95 percent of the greenhouse gases by volume is by far the most abundant and important greenhouse gas.
The other natural greenhouse gas of relevance is methane (CH4), but it is only 0.000175 percent of atmospheric gases and 0,036 percent of all greenhouse gases.
In order to amplify the importance of CO2 they created a measure called “climate sensitivity”. This determines that CO2 is more “effective” as a greenhouse gas than water vapour
Here is a table from Wikipedia showing estimates of the effectiveness of the various GHGs. Notice the range of estimates, which effectively makes the measures meaningless, unless you have a political agenda. Wikipedia acknowledges “It is not possible to state that a certain gas causes an exact percentage of the greenhouse effect.”
La géologie, une science plus que passionnante … et diverse