The Greening Paradox
On the surface, the data looks promising. A recent study led by the Indian Institute of Tropical Meteorology (IITM) in Pune projects that India's vegetation will grow substantially by 2100. This 'greening' trend is driven by increased atmospheric carbon
dioxide (which plants use for photosynthesis) and projected increases in rainfall. The study predicts the most significant gains in plant growth will be seen across the Indo-Gangetic Plain, Northeast India, and the Western Ghats. This increased vegetation is expected to absorb significantly more carbon dioxide, positioning India's ecosystems as a major carbon sink. However, this green expansion is not a universal solution to climate change. The same study warns that while overall productivity may increase, rising temperatures and heat stress can still suppress plant growth and weaken ecosystem resilience.
More Green Doesn't Always Mean More Cool
For urban planners, the nuance in these forecasts is critical. While a key goal of urban greening is to combat the Urban Heat Island (UHI) effect—where cities are significantly hotter than surrounding rural areas—the type of vegetation matters immensely. Simply planting more trees is not enough. Poor species selection can lead to the spread of invasive species, such as Prosopis juliflora in Delhi, which can threaten native biodiversity and groundwater supplies. Effective cooling depends on creating layered vegetation with diverse, native species of trees, shrubs, and herbs. Strategically placed green cover, like avenue trees in Bangalore or interconnected parks in Ahmedabad, can lower local air temperatures by several degrees. However, many Indian cities are losing green cover at an alarming rate due to rapid urbanization, making the need for intelligent, biodiversity-focused green infrastructure more urgent than ever.
The Hidden Biodiversity Cost
The changing climate is forcing a large-scale reorganisation of India's ecosystems. Projections indicate that nearly 40% of India's forested areas could undergo a change in vegetation type by the end of the century. For instance, a recent study on the Western Ghats warns that while the region may remain green, the composition could shift dramatically. Moisture-rich evergreen forests might shrink, while drier thorn forests expand, signaling a hotter, drier regional climate. This transformation poses a grave threat to biodiversity. Species are forced to migrate to new, often higher-altitude areas, as seen with snow leopards in the Himalayas. This disrupts ecosystems, increases human-wildlife conflict, and threatens species that cannot adapt or move. The spread of invasive plant species further chokes out native flora and fauna, reducing the overall health and resilience of our natural habitats.
A New Playbook for a Hotter India
This complex reality demands a more holistic approach from urban planners, policymakers, and students of climate science. The focus must shift from merely increasing tree cover to fostering resilient, biodiverse ecosystems. India's National Mission for a Green India (GIM) reflects this evolving understanding, aiming not just for afforestation but for the restoration of diverse ecosystems like grasslands and wetlands. For urban planners, this means integrating 'blue-green infrastructure'—networks of parks, restored lakes, and green corridors—into city master plans. Success stories from cities like Hyderabad, which developed over 200 urban forests using the Miyawaki technique, show the power of dense, native planting. The key is to move beyond siloed thinking. Climate action, urban development, and biodiversity conservation must be treated as interconnected goals. This requires aligning national policies with local, context-specific planning to ensure that our cities and landscapes are not just green, but truly sustainable and liveable.
