India, June 22 -- For the first time in more than a month, 21-year-old Harshita Kumar has begun taking tentative steps inside Kokilaben Dhirubhai Ambani Hospital. Harshita was critically injured after a massive tree crashed onto an autorickshaw on Linking Road in Khar on May 10. Beside her that day was 15-year-old family friend Aarika Shrivastava, who succumbed to her injuries a week later.

As the monsoon gathers pace and fears of more such accidents grow following another massive branch collapse on the Malabar Hill Nature Trail on June 13, citizens across Mumbai have launched a campaign to identify and geo-tag potentially hazardous trees before they become deadly. Armed with mobile phones and GPS-enabled camera applications, volunteers ...