re: What is the deal with colonizing Mars?

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Do certain extreme climate changers think that the Earth is going to become uninhabitable in the next 100 years or something? In the event that the Earth warms (or cools) to the point that certain existing areas of the world will be very difficult to live in, I get that various populations will face hardship, mass death events and likely wars over resources. But that is more mankind fighting over the available land versus the Earth itself becoming no longer hospitable to life.

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my issue with mars is that we would have to change the entire ecosystem of the planet in order to live there unless everything will be enclosed. I could see using Mars as a stop-over to begin a longer journey with the lack of gravity, it would use much less fuel to launch from there helping with longer journeys.