This is not matter of denying climate change altogether, it is only disagreement about which set of conditions lead to climate change.
Atmospheric carbon dioxide has extremely little to totally non-existent effect on climate, and in fact, is a TRAILING indicator. Warm water gives up carbon dioxide which normally stays dissolved in colder water, and there is a balance between natural generation of carbon dioxide produced by combustion of carbon-based materials with the atmosphere with the oxygen content a little over 20%, either by open burning or the biological activity of living organisms. When carbon dioxide is plentiful, plants grow better and faster, converting the carbon dioxide into various carbohydrates and other organic compounds, and simultaneously releasing free oxygen, without which no advanced living organism could exist.
The heating or cooling of the planet earth as a whole comes from an interruption in the ability to radiate into space the excess heat, balanced by the radiation received from the sun, and the internal heat of the interior core of the earth, which is kept warm by the radioactive decay of elements subject to atomic fission.
“....balanced by the radiation received from the sun, ....”
There seems to be an extra-solar component.
You aroused my curiosity enough to do some Googling. Three search observations I recorded:
So the question is: how much does the Earth's internal (core) heat contribute to the warmth on the surface of the Earth?
And a corollary question: if our inner core's heat should suddenly die, could humans survive using only the Sun's heat?
“Warm water gives up carbon dioxide which normally stays dissolved in colder water...”
Not just the water. The rocks in the earth’s crust also release CO2 they have sequestered as the temperature rises.
Agree, but there are probably many more variables than that contributing - which makes modeling them all by computer simulation highly suspect - at best. Particularly when humans (the climate modelers) seem to throw out data points and alter programs when they don’t fit their hypothesis.