Most researchers today explore high-tech materials like carbon nanotubes or graphene to develop a class of composite known as radar-absorbing material, i.e., a composite that can attenuate radar signals for stealth applications. Such high-tech materials are costly and energy-intensive to produce. Researchers from Brazil and Canada have explored sustainable carbon made of tree bark waste as an affordable alternative to those options. Their findings were recently published in the Journal of Renewable Materials, with insights on how engineering material and design can lead to performances as well as those expensive options. The research also supports the goals of the United Nations’ 2030 Agenda for Sustainable Development, by promoting the use of renewable materials and reducing industrial waste. The team plans to scale up production and test the core material in other real-world situations.