Passive mob system

I have stopped working on the giant tunnel so I can use it to explore new chunks when 1.8 comes out. Instead, I have been preparing for a passive mob system. To get high efficiency, you need to have no passive mobs spawning anywhere else. That means you must remove all the grass within 150 blocks of your start location. I've currently tiled 1920 blocks of grass (15 stone hoes worth). It will take ages. On a plus note, I will soon make a video about my piston elevator!

1.8 will be awesome

Cant wait for it.