The days of tipping co-mingled waste straight into the ground are nearly gone. City growth has not only filled older nearer tips faster but made it almost impossible to find new locations within economic travel distances. And no one wants a tip right next door to their business or backyard.
Witness the recent expensive legal challenge around the new rail-waste interchange at Clyde in Sydney. Travel costs in some cities are also compounded by extensive tollway charges, so you get caught between time travel or the tolls.
Also new landfill tax levies and laws are emerging internationally (such as the LATS scheme in the UK) to force us all to consider alternate waste treatment options.