Find a beach community desiring central government funds to replenish their beaches.
Use the study Andrew found when asking the community leaders to petition their central government representatives to fund a silicate mineral beach replenishment research experiment with partial U.S. Department of Energy (DOE) funding. DOE-FOA-0001037 is currently limited to the deep-earth "Geologic" storage favored by oil companies. If nothing else, talking about beaches and funding to address ocean acidification is a great community education opportunity.
Beach replenishment is generally funded through the U.S. Army Corps of Engineers. It is in vogue on the U.S. East and Gulf Coasts as an adaptation to sea level rise and extreme weather. Politicians like to 'kill two birds with one chunk of taxpayer money' almost as much as 'bringing home the bacon.'
Mark
---------- Original Message --------
Subject: [geo] Carbon dioxide efficiency of terrestrial enhanced
weathering - Environmental Science & Technology (ACS Publications)
From: Andrew Lockley <andrew.lock...@gmail.com>
Date: Wed, March 12, 2014 2:40 am
To: geoengineering <geoengineering@googlegroups.com>
Terrestrial enhanced weathering, the spreading of ultramafic silicate rock flour to enhance natural weathering rates, has been suggested as part of a strategy to reduce global atmospheric CO2 levels. We budget potential CO2 sequestration against associated CO2 emissions to assess the net CO2 removal of terrestrial enhanced weathering. We combine global spatial datasets of potential source rocks, transport networks and application areas with associated CO2 emissions in an optimistic and a pessimistic scenario. The results show that the choice of source rocks and material comminution technique dominate the CO2-efficiency of enhanced weathering. CO2 emissions from transport amount on average 0.5-3% of potentially sequestered CO2. The emissions of material mining and application are negligible. After accounting for all emissions, 0.5-1.0 t CO2 can be sequestered on average per tonne of rock, translating into a unit cost of 1.6 to 9.9 GJ per tonne CO2 sequestered by enhanced weathering. However, to control or reduce the atmospheric CO2 concentrations substantially with enhanced weathering would require very large amounts of rock. Before enhanced weathering could be applied at large scales, more research is needed to assess weathering rates, potential side effects, social acceptability, and mechanisms of governance.--
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