NEW DELHI:
US-based research non-profit organisation World Resources Institute (WRI), in a study titled "Urban Blue-Green Conundrum: A 10-City Study on the Impacts of Urbanization on Natural Infrastructure in India", has found that Delhi's blue cover has shrunk largely due to an increase in built-up area, which increased from 1,216 square kilometre in 2000 to 1,961 sq km in 2015.
The blue cover, however, dropped from 36 sq km in 2000 to 22 sq km in 2015 in the 0-20 km radius, while in the 20-50 km radius, it dipped from 67 sq km in 2000 to 44 sq km in 2015, the study shows. While the 0-20 km radius covers 1,256 sq km within Delhi, a total of 6,596 sq kms is covered in the 20-50 km radius.
The study selected India's 10 most populous cities - Ahmedabad, Bengaluru, Chennai, Delhi, Hyderabad, Jaipur, Kolkata, Mumbai, Pune and Suratwhich account for around a third of India's urban population, and utilised open-source, high-resolution satellite imagery to study the change in the built-up area of cities.
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