Amen! If it turns out we can’t make humans a multiplanetary species in any reasonable timeframe, at least we can make the last few decades of livable earth climate a friendly atmosphere for US business interests.
Even the worst expected impacts of climate change will leave earth tremendously more habitable than anywhere else in the solar system.
Even a nuclear war would have that outcome. Even a KT boundary scale asteroid impact would have that outcome. The rest of the solar system is just hell.
There are plenty of imaginable events where being multiplanetary would help.