That we have a warm season, when ice always melts and retreats, and that we also have a cold season, when snow always falls and ice advances, is extremely important. Ice Volume always decreases in the warm season and Ice Volume always increases in the cold season. It is also extremely important that, as the ice core data shows, that it snows more when the oceans are warm and that it snows less when the oceans are cold. Warming oceans are accompanied by increasing snowfall and accumulation in the cold season. Cooling oceans are accompanied by decreasing snowfall and accumulation in the cold season.
With simple inspection, we can see that this system is extremely stable.
Any Climate model that does not include this should not be expected to exhibit skill at successful forecasts. As far as I have been able to find out, almost every climate modeler only decreases albedo with warmer oceans and the model output indicates tipping points. It is clear from the data that warming brings more snowfall and, because of that, there is an upper bound on temperature and therefore there are no tipping points that go out of bounds.
The only tipping points in the actual data do indicate that when the oceans are warm it always tips toward cooling and when the oceans are cold it always tips toward warming. The tipping points are always in the well bounded direction.
During the Little Ice Age, albedo was higher. Oceans were cold and it did snow much less. Ice extent decreased and lowered albedo and temperature naturally went up. This has continued to the present time. Snowfall rate has increased during this time and now it is to the point that albedo is no longer decreasing and soon, some more years, the snowfall rate will have increased enough to cause albedo to increase and that will cause temperature to go down, just like it always did before, like after the Roman Warm Time and after the Medieval Warm Time.
We may, or may not, be at the max temperature for this warm period, but we are most likely at or near the peak. We could get some albedo decrease and some warmer, but if we do, that increases the snowfall rate and strengthens the upper bound. One more degree, maybe, two more degrees, no way, that would put us above every upper bound in the past ten thousand years.
Look at the data! History is the best forecaster of the future. What has happened before can certainly happen again. What has not happened in the past ten thousand years is not likely to happen in the next hundred or thousand or thousands of years.