Recycling
First, plastic is collected and taken to a recycling center, where it is sorted out. When plastic is sorted out, symbols have to be printed on every recyclable plastic product used. There are two types of plastic: polyethylene and polymer. There are two kinds of polyethylene plastic, too: high density polyethylene (HDPE), and low density polyethylene (LDPE). HDPE plastic is usually used to make furniture, and LDPE plastic are usually things like milk jugs, plastic and grocery bags.