In misc.survivalism Down Under On The Bucket Farm wrote:
Hi Everybody,

I am working on long-term plans for self-sufficiency, oriented to
buying some bare land and building an off-grid house, rainwater
catchment, composting toilet, etc, etc.

One issue is the question of how much physical space would be
needed to grow enough food to completely support myself?

The answer kind of depends if you'r in the middle of the Amazon, Antarctica,
or Austria.