For purpose of discussion, assume that due to bad luck, this asteroid has evaded the detection of all amateur and professional astronomers until about six months from impact. The asteroid is too large to deflect with humanity’s current spacefaring capabilities, and the general scientific consensus is that the impact will end all multicellular life on Earth.
What do those six months look like?
My answer is whatever happened in the movie Don’t Look Up
We all die. :-(
I was so pissed at that movie’s end… Right up until the very final moments where it was all worth it 😁