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Source — Source:TH ///Category — GS Paper 3 ///Published — 2026-01-06 ///Exam — Both Prelims and Mains ///Tags — Rapid Fire CA, Quick Facts For Prelims, Miscellaneous ///Source — Source:TH ///Category — GS Paper 3 ///Published — 2026-01-06 ///Exam — Both Prelims and Mains ///Tags — Rapid Fire CA, Quick Facts For Prelims, Miscellaneous ///

Source:TH · GS Paper 3

Green Paradox in Urban Greening

A recent global study of 761 cities across 105 countries reveals that urban greening can paradoxically increase temperatures in dry, water‑scarce regions, a phenomenon termed the "Green Paradox." This has direct implications for Indian city planners to adopt climate‑appropriate vegetation and integrated heat‑mitigation strategies.

2026-01-06

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Source:TH

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Key Facts and Data Points

Study scope: 761 cities in 105 countries, including Indian cities.
Metric used: Temperature Regulation Capability (TRC) – difference between temperature of vegetated surfaces and built‑up surfaces.
Findings:
Vegetation cooled most cities overall.
~25% of cities (mainly those with annual rainfall < 1,000 mm) showed a net warming effect.
Green Paradox: In arid/semi‑arid cities, limited water reduces evapotranspiration, while vegetation can absorb more solar radiation than some built surfaces, leading to higher surface temperatures.

Background and Context

Urban Heat Island (UHI) Effect: Concrete and asphalt retain heat, raising city temperatures above surrounding rural areas.
Evapotranspiration: The combined process of water evaporation from soil and transpiration from plants; a primary cooling mechanism.
In water‑scarce regions, plants close stomata to conserve water, sharply reducing evaporative cooling.

Significance for India / Governance / Policy

Many Indian cities (e.g., Jaipur, Jodhpur, Hyderabad) fall under the low‑rainfall bracket, making them vulnerable to the Green Paradox.
Policy implication: Urban greening must be climate‑responsive – selecting drought‑resistant native species, optimizing irrigation, and integrating high‑albedo surfaces.
Aligns with Smart Cities Mission, National Mission for a Green India, and National Adaptation Fund for climate‑resilient infrastructure.

Related Constitutional / Legal Provisions

Article 48A (Directive Principle) – State shall protect and improve the environment.
National Action Plan on Climate Change (NAPCC) – includes missions on water, sustainable habitats, and strategic knowledge for climate‑resilient development.

Recommendations

Conduct city‑specific climatic suitability assessments before large‑scale tree planting.
Prioritize native, drought‑tolerant species and green roofs with low water demand.
Combine greening with high‑albedo pavements and cool roofs to offset any warming.
Strengthen urban water management to support sustainable evapotranspiration.

Prepared for UPSC aspirants – focus on factual recall, analytical linkage to policy, and application in Indian context.