I would ask
how did we survive climate change?
and if we didn't try to get any details we tried and didn't work or wasn't fast enough to try again for a better outcome but realizing I would create a bootstrap paradox I would get really depressed.
Then I would spend the rest of the time. Showing the traveler a good time as my time is much nicer then where they came from and I want to let them enjoy what they can before they goes back.