The lack of eccentricity in Earth's orbit is partially to blame, heating our ice-ball very regularly - compared to other eons, where a more-elliptical orbit com

The lack of eccentricity in Earth's orbit is partially to blame, heating our ice-ball very regularly - compared to other eons, where a more-elliptical orbit combined with a greater tilt to reduce solar efficacy. Further, the sun gets 1% smaller and brighter every 20 years[0], likely having some impact as well. [0]https://www.nasa.gov/topics/solarsystem/features/sun-brightness.html https://www.nasa.gov/topics/solarsystem/features/sun-brightn... https://en.m.wikipedia.org/wiki/Milankovitch_cycles https://en.m.wikipedia.org/wiki/Milankovitch_cycles