Historically, Global Warming often creates Ice Ages

Any PHD in Climate Science can tell you this fact.

It doesn't mean that this 100 or 1000 years this is absolutely going to happen but it is a tendency.

What creates this ice age in a situation like we are in now?

Evaporation caused by warming of air and oceans increases so exponentially that lands begin to cool like is happening now here on earth. But, the land is the only thing cooling. So far, it has cooled 1 degree Centigrade because of increased precipitation and clouds preventing heat hitting the earth on lands.

Here is the second fluke factor which is Polar vortexes moving to new areas temporarily like we just experienced.

Now imagine 10 to 20 inches of rain off the Pacific meeting a Polar Vortex drop of significance while these 10 or 20 inches of rain come to earth in the form of 10 to 20 feet of snow. IF the ground is cool enough already from too many clouds the snow does not melt possibly not that year and because when there is snow on the ground in mountains or plains it often also creates it's own weather and snow tends to create more snow falling and when snow falls on snow it doesn't tend to melt especially if there are clouds.

So, all you need is enough rain evaporating off the ocean during a severe Polar vortex drop into the Main U.S. (lower 48) from the Sierras and Cascades East and you have a short or long Ice age given the right fluke conditions where the snow does not melt off completely from year to year.

So, you could theoretically have very warm oceans a whole lot of clouds and still have an ice age from the Sierras and Cascades all across the nation to the Atlantic ocean for years or more at a time.

And this is what has happened before during global warming in the past many many times.

For example, Half Dome in Yosemite and a lot of the rocks there including Yosemite Valley itself were carved by slowly moving glaciers from an ice age. This is also true of alpine lakes and rocks from the Sierras all across the nation in various places.

So, the coast of California, Oregon and possibly Washington would not go into the ice age likely because the water of the ocean would act as a heater upon the land and the air but everywhere east of the Sierras and Cascades likely would be under Ice and Snow from conditions like this.

when will this happen? I don't know. However, this kind of thing has happened many many times before historically under these same conditions.