İstanbul’un Metan Alarmı: Uydular Ne Ölçtü?
Satellite observations have placed Istanbul's waste management system under renewed scientific scrutiny. An analysis by UCLA's STOP Methane Project, using Carbon Mapper data, identified exceptionally high methane emissions from landfill sites in Silivri and Şile. Silivri recorded an average observed emission rate of 7.4 tonnes per hour, while a separate analysis using a different observation period reported 8.4 tonnes per hour. These figures do not establish a continuous increase in emissions. Approximately 4 tonnes per hour were also reported at Şile. Methane is a powerful greenhouse gas produced when organic waste decomposes in oxygen-poor environments. Over a 20-year period, its global warming potential is approximately 80 times greater than that of carbon dioxide. Although Istanbul's landfill facilities operate gas collection and electricity generation systems, satellite observations raise questions about how effectively these systems capture escaping methane. The distinction between environmental impact and immediate public safety is essential. High methane emissions do not automatically indicate dangerous gas concentrations in residential areas. Explosion risks depend on local methane concentrations, ventilation conditions and potential ignition sources. Furthermore, methane itself is odourless, meaning that reported landfill odours cannot independently establish methane exposure levels. The findings highlight the need for transparent environmental monitoring, independent ground-level measurements and regular verification of landfill gas capture performance. Ultimately, Istanbul's methane problem illustrates a broader challenge in environmental governance: satellite technology can now reveal major emissions, but meaningful accountability depends on whether those discoveries lead to measurable and sustained reductions.