The Cooum River, once a sacred river that shaped the history of Madras, has now become a sad sign of urban degradation. For the millions of residents in Chennai, it has transformed into a malodorous, polluted, and stagnant channel, burdened with solid waste accumulation and extensive encroachments along its banks. During a recent datajam organised by Oorvani Foundation and OpenCity, we used Geographical Information System (GIS) datasets and population analytics to investigate the underlying causes contributing to this crisis. The results show that rapid urbanisation, inadequate provision of essential civic infrastructure, and the absence of coherent policy frameworks, along with…

The Pallikaranai Marshland, one of Chennai’s last remaining natural wetlands, has long been a site of ecological tension. Its designation as a Ramsar site brought national and international recognition, along with renewed expectations for strong conservation measures. Yet the marshland continues to face intense pressure from urban development, infrastructure projects and real estate expansion.  Recently, Arappor Iyakkam, an anti-corruption organisation, alleged that state agencies illegally cleared environmental and construction approvals for a large high-value housing project within the Ramsar boundary. As the matter unfolds, it reveals how regulatory gaps and political inaction make the marsh vulnerable. Meanwhile, residents of Tansi…