Andrew:  cc list

        For biochar, add the concepts of internal rate of return (IRR) and 
recommended analysis time period (30 years?  100 years?) (as a few of the 
needed extra parameters, for given types of soil, climate, species, etc).  
First cost is not the right parameter.

Ron


> On Feb 4, 2018, at 5:28 AM, Andrew Lockley <andrew.lock...@gmail.com> wrote:
> 
> Hi
> 
> I'm designing a survey on attitudes to CE, and I'm trying to simplify the 
> costs estimates by making it per person per year. I've put $1 for SRM and 
> $100 for CDR - but it occurs to me that this is really very complicated. Has 
> anyone done any proper research on this? I can't find anything... 
> 
> Typically, SRM is costed on a program basis (bn/yr globally) but CDR is 
> costed per tonne (and volumes are highly variable).
> 
> Issues to roll into this calculation are
> * population growth
> * future emissions (CDR gets a lot more expensive, if you're still emitting)
> * whether temperature stabilises or reduces - and how fast
> * experience/cost curve for each approach
> * how much heterogeneity to expect (it's likely impractical to expect only a 
> single CDR to do everything)
> 
> There are probably other factors. This strikes me as something that's 
> sufficiently useful to be worked up into a paper.
> 
> Andrew
> 
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