Well, Earth’s orbit is roughly stable, solar output is roughly stable but both have long term oscillations but within somewhat stable parameters. That’s just lu

Well, Earth’s orbit is roughly stable, solar output is roughly stable but both have long term oscillations but within somewhat stable parameters. That’s just luck. There are some effects that cause unstable feedback loops though. Rising temperatures trigger several effects that lead to even more temperature rise. Reflective ice caps melt, tundra thaws releasing methane. Frozen methane in ocean sediments melts. Similarly our planet has been through several deep freeze events, far more severe than ice ages. If temperatures drop too much the ice reflects too much solar radiation leading to more freezing.