Impossible. The temperature of the earth’s core is several million degrees.
Just ask Al Gore.
The interior of the earth has pockets of superheated steam, part of the force powering volcanic eruptions. Water is part of the structure of many minerals, integrated in the structure and providing the characteristics that distinguish a vast majority of minerals, particularly silicate minerals.
Under the heat and pressure in the earth’s core, and extending up to the “Mohorovicic Discontinuity” - also known as the Moho, there is a vast seething cauldron of ongoing chemical and physical reactions going on, but nowhere does the temperature reach “millions of degrees”. Surprising things like free hydrogen, and liquid carbon monoxide, or even molten carbon, are found in great profusion, joining and dissociating in a vast number of chemical reactions that are in a constant state of flux, until some such time as there is a vent released to the surface.
We have not the foggiest idea how to harness all this energy and the products of its expenditure.
But someone in coming centuries will discover the key, and the promise of virtually boundless “free” energy will ascertain future prosperity far beyond the artificial and unrealistic limitations of production of carbon dioxide.