India's Parks Face Nitrogen Overload by 2030

By 2030, India's national parks face a substantial risk of harmful nitrogen pollution, according to a recent high-resolution assessment. This pollution can degrade ecosystems by increasing acidity, reducing nutrients, and altering plant and animal communities. Scientists attribute this trend primarily to rising nitrogen oxide emissions from vehicles and industries across the nation.

The study, conducted by researchers from the Indian Institute of Tropical Meteorology and the UK Centre for Ecology & Hydrology, employed computer modeling to project nitrogen deposition across 104 national parks. These projections were compared against "critical load" thresholds established in the US, Europe, and China, as India currently lacks its own ecological safety benchmarks.

Initial findings in 2015 showed several parks already exceeding these international thresholds. Projections indicate a concerning rise by 2030, with a significant increase in annual reactive nitrogen deposition anticipated nationwide. This rise is expected to disproportionately affect twelve states and Union Territories, impacting numerous ecologically sensitive zones within them.

Specific ecosystems, including mangrove and alpine environments, are identified as particularly vulnerable. The study warns of potential cascading ecological impacts, such as weakened carbon storage in mangroves and reduced soil organism diversity in forests. Furthermore, nitrogen runoff into aquatic systems poses a threat to wetlands and lakes, increasing the risk of algal blooms.

While the study provides valuable insights, researchers emphasize the need for caution due to the reliance on international thresholds. They advocate for long-term field studies to establish India-specific ecological limits and better inform conservation efforts. The findings underscore an urgent need for monitoring and mitigation strategies to protect India's natural heritage from escalating nitrogen deposition.