Of the total area that is used by humans (Agriculture, Urban and Built-up Land),
- urban and built-up land is 1m km²,
- agriculture is 48m km²,
so agriculture is 48 of 49 millions km² used, that’s 98%. The remaining 2% are all streets and housing and other infrastructure together.
Well done for mentioning hemp. Hemp’s actually a great example confounding the over-simplified division, being great for both food production and non-food production, like sheep too (for wool and meat). Efficient use would not be wasting anything from any production, further confounding the over-simplified division. Capitalist big industry has a bad habit of not doing that kind of efficiency though.