Re: Green air traffic?

On Jul 19, 9:15 pm, thro...@xxxxxxxxx (Wayne Throop) wrote:
:::: I understand greenhouse gas emissions from cars would be all but
:::: eliminated if we all switched to BEVs powered by nuke plants.  Is
:::: there any way to do the same with planes?  TIA.
::: Not really.  =A0Nuke plants can separate water to hydrogen and oxy,
::: but H2 tankage is a pain and not really practical yet.  =A0For the
::: moment greenhouse gasses from planes pretty much have to be "offset"
::: by from-atmosphere Carbon Capture & Storage, or by new wood growth
::: in an offset somewhere.
:: Modified Fischer-Tropsch plants can convert hydrogen (from
:: electrolysis, say) and carbon dioxide into hydrocarbon liquid fuel.
:: If the CO2 is extracted from the air then this is a net zero carbon
:: fuel for airplanes.
: I'm sure there are several ways to go about this.  Compressed air,
: laser powered takeoffs, battery powered engines.  Broadcast
: microwave power.

This seems to come up ever couple months as a topic.
I note that in additional to industrial synthesis, there's biosysntesis.
According to stuff from MacKay's "Sustainable Energy (without the hot
air)" the amount of energy that could be gotten from biomass 24kwh/d
is in the same ballpark as that now spent on aviation (30 kwh/d).
Of course... that's not biofuels as in "could be fed into un-redesigned
jet engines", but still.  So if everything else is handled in other ways,
aviation could plausibly use biofuels.

Wayne Throop   thro...@xxxxxxxxx  http://sheol.org/throopw

I'm not suggesting that any of those things I mentioned are "near
term" practical, but I think some combination of them is liable to
technically feasible. For "real world" practical uses it seems to me
if we reduced our CO2 output from all sources enough we could surely
offset our air travel via reforestation projects. (Not that any of
that will happen, we've trashed the planet and are likely to continue
to trash it right up to either near or complete extinction, but it's
nice to know some of us care a bit.)
.

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