Please see my latest Examiner article –

Why hemp could save the world

See also this really cool document from 1817:

Plan for Reducing the Poor’s-Rate by Giving Permanent Employment to the Labouring Classes: With Some Observations on the Cultivation of Flax and Hemp; and An Account of a New Process for Dressing and Preparing Flax and Hemp, without Water-Steeping or Dew-rotting