On 6/2/2013 12:58 PM, Ron wrote:

Have you any similar cost estimates for the biotic CDR approaches, such as 
afforestation, BECCES and biochar?

No -- I just didn't have room to cover everything, or even most ideas. A nice, longer review article that does is

"Negative Emissions Technologies," Dr Niall R McGlashan, Dr Mark H W Workman, Ben Caldecott and Professor Nilay Shah, Grantham Institute for Climate Change, Briefing paper No 8, October 2012
https://workspace.imperial.ac.uk/climatechange/Public/pdfs/Briefing%20Papers/Briefing%20Paper%208.pdf

David

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