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Climate Colab

Aug 6, 2014


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I hate to pile on, but I have to reject this one also for not being inline with the regulatory focus of this years topic. I've noticed how often you work on and edit your proposals, and its obvious you've but a lot of time into both of them. I hope you'll come back for next years geoengineering contest, especially if they are looking for substantive plans. On a more specific note, as I was just looking through the proposal, I noticed again that you cite 8 metric tons of carbon dioxide sequestered per year per acre of Sargassum. That makes me doubtful about the scalability of the project because humans are currently emitted 9.7 billion metric tons of carbon dioxide/year ( That means it would take over a billion acres to cancel out all of carbon emissions. I did some back of the envelope calculations and the earth, in total is about 125 billion acres, so it would take about 1% of the earths surface. Even though we likely wouldn't need to reduce emissions 100% just with this technique, the scale is a red flag for me. i would love to see the question of scalability and a realistic estimate of carbon sequestration from this technique addressed in some depth. You've done good work, though, and I hope you'll keep it up.