Aarg! You’re right, of course, about no-till not generating as much soil erosion as regular farming–it’s still more than from timber production. It’s not very popular, though. And, I was assuming that you were going to make paper out of hemp–my bad, sorry.
Hemp is probably a lot better than cotton because I don’t think you have to use so many chemicals. I love cotton to sew with and wear, but I do feel guilty about using it–after all farmers use pre-emergent herbicide, chemical fertilizer, and defoliant and maybe even post emergent herbicide. Plus, even in the Mississippi River Delta, some farmers are irrigating with ground water! Naturally, they are doing this out west.
But, I agree with Mr. Arthur that having cloth bags would probably be better in the long run than either plastic or paper–for sure if you never washed the bags 
A litte polyester mixed with that cotton or hemp would probably make them almost indestructable! Just think, you could leave the bags as a legacy to your great-grand children!
But,if I stopped bringing home groceries in plastic bags what would I put the trash in–especially the kitty litter scoop? Help, we need a Environmental Guy to answer all these hard questions!