Originally Posted by
tandempower
So the more we drill and mine and allow water to seep deeper and deeper into the crust, the faster core heat is going to dissipate through the water. Fossil fuels kept underground may end up burning under pressure and help keep the core molten. Nature may have a reason for swallowing up biomass and compressing it underground besides to have people dig it up, burn it above ground, and fill the hole left with water.
Nature doesn't have a reason - things happen because they happen.
Our influence on the cooling of the earth's core is negligible - I wouldn't worry about that. We're far more threatened by its heat (think supervolcano eruption) than we are by its cooling.