You might be thinking about Allan Savory's work on dense rotational grazing for land regeneration purposes in savannas and rangelands. Quick TED talk to get you

You might be thinking about Allan Savory's work on dense rotational grazing for land regeneration purposes in savannas and rangelands. Quick TED talk to get you started: https://www.ted.com/talks/allan_savory_how_to_green_the_world_s_deserts_and_reverse_climate_change https://www.ted.com/talks/allan_savory_how_to_green_the_worl...