The race

The sun will get too hot someday. Also worrisome is that the core is cooling... faster than we'd thought.

The study is based on various minerals we have in our mantle. Not Olivine Websterite as I'd expected but bridgmanite, which turns into the mineral post-perovskite when it cools. Both conduct heat, the latter even more so.

MORE 1/22: I'd be interested in what thermodynamics should conclude, as the heat from the core radiates more efficiently. It would go into the mantle-plumes, I should imagine.

For Earth, keeping our pleasant atmosphere and our ability to survive on the surface depend, both, upon both our core-driven dynamo and on Solar irradiance. We need that orbital ring.