Here's the real deal. We have natural climate cycles on planet Earth. They result from a variety of factors: Sun spots, heating cycles of the Sun, rotating orbit, and others that I've forgotten.
And if we plot out these cycles we see that each one spikes rapidly to a warm high, which is when the glaciers melt and the Bearing becomes a strait of water. But then each cycle begins to cool. And at the bottom of each one, we have an ice age when the planet is covered with glaciers and the Bearing becomes a land bridge because the water is locked up in the glaciers.
The period of such climate cycles is tens of thousands of years. And we are coming off the point where the Bearing is a strait, not a land bridge. In other words, we are coming off the global warm part of the cycle.
The planet should be cooling down, towards another ice age, if it's following its natural climate cycle. [See source.]
But it isn't. And the only difference between all the previous half dozen or so well-documented climate cycles and this current one is the effects of fossil fuel burning by mankind. It's not rocket science; humankind is causing the planet to warm up when it should be cooling down.