Apply this carbon life-cycle analysis to hemp grain as food replacing high-carbon-impact CAFO meat and the impact is at least 3-times larger.
This study compares the carbon impact of hempcrete to 3 conventional insulations.
But once a wall is built it will never need hemp again, whereas grain as food is already consumed by millions and sold by thousands of retailers daily.
Read it at: https://www.sciencedirect.com/science/article/abs/pii/S0959652625008595