In America we used to grow a lot of hemp but Hearst who owned newspapers and timber to make the paper wanted it banned. The cotton farmers also lobbied against hemp.
Hemp is strong and fast growing and can be used for rope and all kinds of products.
As I recall it was not just the Hearst news organization but DuPont came up with nylon 6,6 about the time hemp because illegal. It competed with hemp.
What seems to be missing in this story is what happens to hemp when it decomposes. Methane is released.
So just growing hemp and composting it doesn’t help. It would have to be made into food and durable goods to reduce “greenhouse gases”.