Jon Schild writes:

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 kind of suspect that given an infinitely vast stretch of time
to work on the problem people might be able to figure out a way to treat
knees so that they get back to working comfortably like what they should.

--
Joseph Nebus
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And they make excellent progress on commercial fusion power plants,
too.