Michio Kaku says we will be hit with a planet killer, and it will be our death warrant. https://youtu.be/TvnUZbp8lPE

I posted earlier that we can grow vegetables without the sun. They grow under carefully selected light spectrum. https://wildlandstour.com/urban-agriculture-3/

The original biosphere was very much a work in progress. https://www.science101.com/what-happened-original-biodome-astonish/

This video suggests getting to a nuclear bunker. https://youtu.be/jy0_9c3xUSs

With millions of years to prepare, we should be able to perfect an underground biosphere. In the meantime, we could be growing our vegetables down there.