I think there are much more important issues like space: Improperly constructed and maintained landfills (i.e. most of them) leak pollutants into the ground (water) and offgas significant quantities of methane. (No sources handy right now...)
This is currently an issue in Russia. Big cities like Moscow produce a lot of waste and the cheapest way to utilise it was to dump to a landfill in a countryside. Now people living nearby are protesting because the gases from the landfill are carried by the wind to their town several kilemeters away.