We know it happens periodically, we know pollution is contributing to it.
We also know the World is accelerating into the abyss without and thoughts of slowing down. Which will result in mass extinctions and billions of lives lost.
Water will become the most sought after natural resource to drink and provide food. Its scarcity will kill billions and make food very expensive. All made far worse by the growth in population numbers.
Pollution will continue to contribute to the effect as we demand more and more. Much of which we don't need and discard. And produced in countries that are the worse polluters.
Anyone who compares today with the past is missing the truth.
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At no time in the past did the Earth have to support so many.