Over >50% of the space humans occupy is for agriculture

i think it's more like >90%.

i.e. of the area that is used (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 for streets and housing.