Comment Re:I presume you will need a lot of layers of this (Score 1) 130
From a mile-high perspective, of course the average engineer should see promise here... unless they work with microbiologists implementing bioengineering solutions, whether waste treatment, energy production, or biomass production. Then all of the complexity of even relatively simple earth-bound bioreactors will temper expectations.
The nutrients that a fungus needs are carbohydrates and oxygen. Everything I've seen indicates that radiotrophy (using radiation for energy) is just bonus energy; I really doubt we'll find any articles anywhere that say that it can live as a true autotroph (living on CO2 and light). That might not be possible even with aggressive genetic engineering - the nuts and bolts of it are that a fungus does its basic work the way all fungi do - as an obligate aerobe; i.e., it will die without oxygen.
Anyways, just to get your 2% shield, you'll need to be able to diffuse oxygen and a carbon substrate that it likes through the layer (or through the porous media you're growing it in to get multiple layers). Ask any microbiologist how easy it would be to convince a fungus to grow where you want it to, in a (relatively) homogenous 3-dimensional structure, and to keep a random pathogen from getting into your monoculture and buggering it all up.
Pardon the pun, but it would be astronomically difficult, even with all of the investments we've made in thin-film and three-dimensional bioreactors here on earth. I can't even think of a good example for this, but it would be like trying to make a Tesla run on gas. Ok, maybe you stick a generator in the trunk to get some a range boost - that part is easy, but ditching the whole integral charging system to make it JUST run on gas, and to operate as well or better than it did on electricity alone - that would be a heck of a lot more work. Not necessarily impossible, but probably not worth the effort.