Philadelphia is now burning about half of its 1.5 million residents’ recycling material in an incinerator that converts waste to energy. In Memphis, the international airport still has recycling bins around the terminals, but every collected can, bottle and newspaper is sent to a landfill. And last month, officials in the central Florida city of Deltona faced the reality that, despite their best efforts to recycle, their curbside program was not working and suspended it.