The Colombian president stated this at the COP28:

The emptying of populations from the South to the North and the march of entire populations to the North is underway. The enormous social inequality regarding carbon consumption and the rising increase in carbon in the wealthy North population causes the exodus from the south to the north.

There are tens of million people today; tomorrow they will be hundreds of millions. What will happen with this exodus? What will happen to democracy? What will happen to international law? What will happen to humanity?

I invite all of you to imagine a combination of facts — the projection of the climate crisis in five or ten years and the current genocide of the Palestinian people. Are these facts disconnected? Or can we look at there [Gaza] as a mirror of the immediate future? The unleashing of genocide and barbarism on the Palestinian people is what awaits the exodus of the peoples of the South unleashed by the climate crisis.

Most of the climate victims, whose number will increase in billions, will be in countries that do not emit at all or emit very little CO2. Without transfers of wealth from the North to the South, climate victims will have less water in their habitats and will move towards the North, where melting ice will allow fresh water. The exodus will involve billions.

​This immense exodus will have a response in the North. We are already seeing it in the anti-immigration policies of rich countries and the rise of the extreme right within them. Hitler is knocking on the European and American middle-class homes’ doors and many are letting him in. The exodus will be responded to with a lot of violence and barbarism. What we are seeing in Gaza is a rehearsal of the future.

https://peoplesdispatch.org/2023/12/03/in-cop28-speech-colombian-president-gustavo-petro-calls-for-a-free-palestine/#:~:text=In%20his%20opening%20remarks%20to,of%20what%20is%20to%20come.