Genetically engineer people to live on other worlds, or in space itself
Imagine genetically engineered humans who could live on the surface of
Venus or in Europa's ocean, or stand and live on Mars without needing a
spacesuit.
That would surely ensure the survival of our species. And for those who
say those beings wouldn't be human, well, we aren't quite the same as
our ancestors were several million years ago, but I don't see anyone
crying over that so-called loss.
If we encounter other biological type beings in the galaxy, the odds will
be pretty good that they are also the creation of ancestors who look
and probably even act nothing like them.
Read the Space forum for all those arguments about why current human
beings can't survive in a space colony; then see why we need to change
humanity to do just that.