Multiple Choice, Multiple Answers

Read the passage and select ALL correct options. Wrong selections lose points.

The Greenfield materials recovery facility processes household recycling through a series of automated sorting stages before any human ever touches the material. Optical scanners identify plastics by resin type and blast them with jets of air into separate chutes, while overhead magnets pull out steel cans and eddy currents repel aluminium into a distinct bin. Glass, however, still requires manual sorting by colour, since automated systems struggle to distinguish shades reliably enough for the specifications glass manufacturers demand. Facility managers report that contamination from food residue and plastic bags mistakenly placed in recycling bins remains the single biggest obstacle to efficiency, often forcing entire truckloads to be redirected to landfill rather than processed.