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robert super interesting stuff you are doing here. I would argue that maybe using real options theory to discount uncertainty in technology developments which are "one way functions" for cost reductions in storage probably negates the need to push for storage beyond 100 years at this point due to decreasing energy costs, and likely learning curve effects. The thinking being that quick fast action today has a higher marginal payout relative to the relative high uncertainty of cost declines tomorrow. Its a lets just get going posture that says do everything and focus on 100 year, don't get hung up on "super durability" unless marginal. interested in thoughts relative to volatility of cost declines for future removals. https://en.wikipedia.org/wiki/Real_options_valuation

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