Things are already getting worse climate-wise. We’ve had a string of hottest years ever. The average global temperature is rising. Polar ice and mountain glaciers are waning. Tundra is melting, and releasing more greenhouse gases. The complex weather systems of Earth are becoming chaotic and less predictable–as climate change theory predicts (a theory is a evidence-supported premise and proposed set of conditions and results to be tested and changed according to new results, not a wild-assed guess as the “climate change is a Chinese hoax” crowd would have it).
Maybe the world will find the will to take the drastic action needed to keep things from getting much worse, or out of control forever leading to a greenhouse Earth that looks like a second Venus.
And maybe it won’t and Earth is already dead–we just don’t know it.
The next 500 years will tell the tale.
But, if the option is to flee, settling the Solar System WILL NOT save the bulk of humanity, though it may save the species.
Barring totally amazing technological developments like Blish’s “spindizzy” in his Cities in Flight series that can lift whole cities off the planet, there’s not a way to evacuate billions of people.
More likely is a The Expanse-type world in which there are settlements all across the Solar System, but they’re limited in carrying capacity and reproducing on their own. There won’t be a hell of a lot of room for Earthers.
Most of them, if things go badly wrong, will die desperate deaths.
Agitate for climate action if you want to avert that future.
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