What are those costs? My general understanding is that it may break down in a gassy way, but is that really so significant that it justifies the energy and opportunity cost involved in sorting and processing it for recycling? How does the cost of paper recycling compare to the cost of scaling up landfill gas recovery (something most operators are looking to do anyhow)?

Far as I can tell, some of the most popular recycled paper products, such as paperboard and molded pulp, actually require somewhere around twice as much energy to produce as virgin paperboard and molded pulp products.