Guam imports nearly everything, including the materials it builds with. A team at the University of Guam is asking a deceptively simple question: what if the island's trash could replace some of those shipping-container loads of timber, plastic and cement?
Ernesto Guades, chair of civil engineering at UOG's School of Engineering, leads a series of projects with the Guam Green Growth (G3) Circular Economy Makerspace and Innovation Hub that test whether local waste streams can become raw materials. The flagship effort prototypes plastic lumber at the Makerspace, funded through the Pacific Regional Integrated Sciences and Assessments program via the UOG Center for Island Sustainability and Sea Grant.
The work started with polypropylene (Type 5 plastic, the stuff of takeaway food containers) and has widened to include high-density polyethylene (Type 2) and blends of different plastics. Guades says the strength of the team's prototypes is comparable to commercial plastic lumber, which is already on the market but tends to be expensive and limited in use. The goal is a cheaper, locally made product with broader reach, eventually structural components for houses and even small bridges.
There's a second thread, too: hybridised materials that mix synthetic polymers with organic or inorganic fillers, a route that could turn more of Guam's mixed waste into usable feedstock.
Students are part of the push. Azer Bilimon, a UOG engineering student from the Marshall Islands, researched coconut fibres as reinforcement in mortar, testing fibre types, lengths and quantities, and comparing seawater mixtures with freshwater ones. Using discarded coconut shells and seawater tackles two island problems at once: waste and water scarcity. The project earned Bilimon the Native American/Indigenous Student Research Abstract Award at the 2025 SACNAS National Diversity in STEM Conference, and he frames it as climate-driven: the Marshall Islands is on the front line of sea-level rise, and he wants engineering skills that help his home community.
Why should a traveller care? Because Guam is quietly building a model that most visitors never hear about. The G3 Makerspace exists to show what a circular economy looks like in practice on a small island: materials collected, transformed and kept in use rather than dumped. For anyone interested in sustainability, regenerative travel or island innovation, it's a genuinely interesting story happening at the edge of the Pacific, and one that shapes how the island manages the waste generated by tourism and everyday life. Keep an eye on G3's public programmes and events if you're passing through; this is the kind of local initiative that rewards a curious visitor.
