Robert Clark wrote:
Would you give up your immortality to ensure the success of a
posthuman world?

Absolutely. And it isn't that hard a question. Maybe when you are 20 or
30 the idea of living forever seems attractive, but wait until you get
older and assorted body parts no longer work like they should. Then you
can understand the full meaning of a button I have seen at several
worldcons:

"Immortality -- A Fate Worse than Death"

--
I do not feel obliged to believe that the same God who has endowed us
with sense, reason, and intellect has intended us to forgo their use.
-- Galileo Galilei