Increasing informal settlements are characterised by unplanned land management; lack of housing, sanitation, sufficient water and electricity supplies; overpopulation; high health risks; and growing urban poverty. These informal settlements are mostly occupied by citizens and immigrant families who seek job opportunities in urban areas. To sustain the ecology of the invaded land and provide a liveable informal settlement, education of the inhabitants is essential. Teachers as the implementers of sustainable environment curricula could be valuable in addressing the environmental challenges these informal settlement communities experience by educating children on how to sustain the environment. Data were collected by means of a literature study and an online survey consisting of closed and open-ended questions completed by student teachers (n = 280). Participants’ perceptions, perspectives, and experiences regarding educating informal settlement inhabitants in the sustainment of the environment were significant in answering the research questions. Most of the participants (n = 216) had visited informal settings, 48 were inhabitants, and 16 had never visited an informal settlement. Most of them believed that educating children at an early age and the inclusion of a compulsory subject on the sustainability of the environment were essential. Education can contribute to the sustainment of clean water, food, and the environment. Additionally, interactive community projects such as recycling, waste management, composting, aquaponics to grow plants, and infrared thermal imaging to detect plant diseases could assist informal settlement inhabitants in sustaining the environment.