The hemp crop absorbs CO2 gas as it grows, retaining the carbon and releasing the oxygen.
"HGS and The C-Change Trust have partnered to develop a system for offsetting and retiring carbon emissions through UK hemp cultivation."
From Hemp Global Solutions (HGS) science page.
CO2 Absorbed per tonne of hemp stem 1.37t
CO2 Absorbed per hectare (stem) (UK) 7.47 to 11.25t
CO2 Absorbed per hectare (root and leaf) UK) 1.40 to 2.06t
