This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.
- Please post all quotes separately, so that they can be voted up/down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
- Do not quote yourself.
- Do not quote comments/posts on LW/OB.
- No more than 5 quotes per person per monthly thread, please.
"He who refuses to do arithmetic is doomed to talk nonsense."
-John McCarthy, on mainstream environmentalism.
As someone who regularly gets into arguments about this, I can say that he's definitely right; you wouldn't believe the amount of nonsense that can be disposed of simply by looking up the relevant numbers and doing a minute's worth of easy arithmetic.
For example, I've heard some people recently claiming that a combination of solar photovoltaics, electrolysis to produce hydrogen, and these new Bloom box fuel cells are cheaper than nuclear fission. Look up the costs of solar farms; about $3 per peak watt. Their average power output is less; we can very optimistically assume that they run at 20% of capacity on average. Efficiency losses from electrolysis and fuel cells are about 50%. Putting it all together, this would cost about $30 per watt of average power delivered. Not including the cost of the fuel cells.
A little googling will show that the total cost of building two new AP1000 reactors in Georgia is about $14 billion, and they average at least 93% of their peak power, and transmission line losses bring their average power delivered to about 1000 MW each. So their cost is about $7 per watt of average power delivered, or about 23% the cost of solar.
There's a lot of extremely harmful bullshit out there, and defeating most of it doesn't take any advanced techniques; it just takes a willingness to look up some relevant numbers and do a bit of arithmetic.
You can't run cars with power that comes directly through the power line.
You ignore the running cost of the nuclear reactors. You don't price risk from blowups and you don't price long term storage costs. Risk from peak uranium http://www.technologyreview.com/blog/arxiv/24414 is also unpriced.
If the word "average" would be meaningful in this context than you would simply compare solar cell productivity + transmission line losses to nuclear plant costs + transmission line losses.
Of course you can do simply arithmetic but that doesn't mean that you are right when it's not clear that you are using the right numbers.