Florian,
Echo Greg with your work on terrestrial afforestation/BECCS. Would you like to expand into marine afforestation like at http://climatecolab.org/web/guest/plans/-/plans/contestId/1300701/planId/1307120. Ocean Forests also have a BECCS component when the biomethane combustion exhaust is captured, perhaps as Greg suggests.
---------- Original Message --------
Subject: Re: [geo] Investigating afforestation and bioenergy CCS as
climate change mitigation strategies - ERL - IOP
From: Greg Rau <gh...@sbcglobal.net>
Date: Sat, July 12, 2014 10:12 am
To: "florian.humpenoe...@pik-potsdam.de"
<florian.humpenoe...@pik-potsdam.de>
Cc: geoengineering <geoengineering@googlegroups.com>
--Florian,Congrats on your recent afforestation/BECCS paper. Important overview of the issues. If cost and questionable C storage space are holding back the BECCS strategy, you ought to consider cheaper (and more beneficial) ways of capturing and storing the CO2, the AWL approach being one example:Here, for at least half the cost of CCS you can spontaneously convert the BE CO2 and store as ocean alkalinity where it can also help offset the ocean acidification problem. OK, this is only relevant in coastal areas, but those sites will be the low hanging fruit, cost wise, and hence should be first in line for R&D and applications if you are serious about storing CO2 from BE.Another angle is marine biomass for BE, why compete with land food and fiber production (and water use) when you've got more than a few GT of biomass out there on the other 70% of the Earth's surface?Anyway, under the circumstances, time to think outside the box.Regards,Greg Rau
From: Andrew Lockley <andrew.lock...@gmail.com>
To: geoengineering <geoengineering@googlegroups.com>
Sent: Saturday, July 12, 2014 7:10 AM
Subject: [geo] Investigating afforestation and bioenergy CCS as climate change mitigation strategies - ERL - IOP
Open accessEnvironmental Research Letters Volume 9, Number 6Florian Humpenöder et al 2014 Environ. Res. Lett. 064029 doi:10.1088/1748-9326/9/6/064029Investigating afforestation and bioenergy CCS as climate change mitigationAbstractThe land-use sector can contribute to climate change mitigation not only by reducing greenhouse gas (GHG) emissions, but also by increasing carbon uptake from the atmosphere and thereby creating negative CO2 emissions. In this paper, we investigate two land-based climate change mitigation strategies for carbon removal: (1) afforestation and (2) bioenergy in combination with carbon capture and storage technology (bioenergy CCS). In our approach, a global tax on GHG emissions aimed at ambitious climate change mitigation incentivizes land-based mitigation by penalizing positive and rewarding negative CO2 emissions from the land-use system. We analyze afforestation and bioenergy CCS as standalone and combined mitigation strategies. We find that afforestation is a cost-efficient strategy for carbon removal at relatively low carbon prices, while bioenergy CCS becomes competitive only at higher prices. According to our results, cumulative carbon removal due to afforestation and bioenergy CCS is similar at the end of 21st century (600–700 GtCO2), while land-demand for afforestation is much higher compared to bioenergy CCS. In the combined setting, we identify competition for land, but the impact on the mitigation potential (1000 GtCO2) is partially alleviated by productivity increases in the agricultural sector. Moreover, our results indicate that early-century afforestation presumably will not negatively impact carbon removal due to bioenergy CCS in the second half of the 21st century. A sensitivity analysis shows that land-based mitigation is very sensitive to different levels of GHG taxes. Besides that, the mitigation potential of bioenergy CCS highly depends on the development of future bioenergy yields and the availability of geological carbon storage, while for afforestation projects the length of the crediting period is crucial.--
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