Glass bottles can be more pleasant to drink out of, but they also require more energy to manufacture and recycle. Glass bottles consume 170 to 250 percent more energy and emit 200 to 400 percent more carbon than plastic bottles, due mostly to the heat energy required in the manufacturing process.80 Of course, if the extra energy required by glass were produced from emissions-free sources, it wouldn’t necessarily matter that glass bottles required more energy to make and move. “If the energy is nuclear power or renewables there should be less of an environmental impact,” notes Figgener.81
