What makes a glue stick depends on the composition. In modern manufacturing, it’s common to use adhesives based on petrochemicals, cyanoacrylate polymers, polyurethane, and epoxy. Each of these substances leaves its own impact on the environment.
However, some adhesives are derived from natural materials, making them both sustainable and biodegradable. Plant-based liquid glues can be made from a variety of starches like corn, wheat, and potato. Other biodegradable adhesives can be sourced from gelatin netting.