Putting the life back in science fiction


Facepalm with a hit of nitrous
July 28, 2016, 7:01 pm
Filed under: climate change, futurism, Real Science Content, Uncategorized | Tags: , ,

I’ve been advocating for a partial switch to an ammonia-based economy, on the theory that, while NOx is an air pollutant, it’s better than CO2.

Facepalm time: N2O, good ol’ nitrous oxide, which is another thing that comes out of of using ammonia for fertilizer or burning it, is a greenhouse gas 100 times more potent per pound than CO2.  Right now, it’s 5.9% of US greenhouse gas emissions.  It supposedly lasts about 114 years in the atmosphere, until it gets broken down by some process or other (I’m being lazy about all the bits and bobs in the nitrogen cycle, because it’s hot here, and with a flex alert on, I’m not running the AC). Unlike CO2, it doesn’t look like it sequentially saturates large sinks and stays around for hundreds of thousands of years in the atmosphere.  Rather, it just breaks down slowly.  About 40% of the N2O emitted in the world is from human activities, and it can be cut, in some circumstances, through catalytic conversion technology.

Here’s some really basic information on it (link to EPA)

The basic sources for atmospheric N2O are:

  • conversion of nitrogen fertilizers to N2O by bacteria.  This is the big one, and more efficient fertilizer use and better land management can cut this to some degree.
  • it’s a combustion byproduct, so it comes out the tailpipes of gas-burning cars.  Catalytic convertors can help with this.
  • various industrial processes produce N2O as a byproduct.

Now, the simplistic solution is hydrogen, except that (IIRC) burning hydrogen using air also may release some N2O, because there’s a lot of nitrogen in the air.  Converting to fuel cell-type devices that do electrochemistry rather than combustion and using catalytic convertors on combustion-powered systems probably is the way to go.

It does get more complicated than that.  While catalysis is the simple-minded solution, it’s also prey to the usual simple-minded problems with polluters who don’t keep that part of their car (or other system) working, and thieves after the platinum in the convertors.  It’s the usual, intractable problem: environmental problems, greed, and stupidity don’t mix.

So, what do you think?  Pitch any desire for an ammonia economy out the window and pray for hydrogen and better batteries?  Double-down on catalysis, which catches NOx better than CO2, and start prospecting for platinum at the side of the local highways?  Stick with fossil fuels and assume we’re all doomed?  Some combination of all three?

Oh well, tonight I get to watch  the latest episode of the newest superhero series: Suit Woman vs. Generalissimo Cantaloupe.   I’m not sure binge watching is the right word for it (more the opposite), but it does seem to be the thing everyone’s talking about this season.