> Absolutely useless Not at all. To say "we don't know" might mean that we don't know the order of magnitude. Order of magnitude estimates to the first or seco

> Absolutely useless Not at all. To say "we don't know" might mean that we don't know the order of magnitude. Order of magnitude estimates to the first or second decimal place are oftentimes more than enough to hone in on a solution. In this case the two orders of magnitude set a clear bound (assuming the capacity estimate are accurate) for the near future at the high end and provide a warning sign for the present.