The central Indian state of Madhya Pradesh set a new Guinness World Record on Sunday after 1.5 million volunteers planted more than 66 million tree saplings in just 12 hours along the Narmada river.

The effort bested the state of Uttar Pradesh's previous record-breaking feat, when 800,000 participants planted 50 million trees in one day in July 2016.

Shivraj Singh Chouhan, the chief minister of Madhya Pradesh, boasted the achievement: "I am extremely proud to happily share that people of Madhya Pradesh successfully planted 6.63 Crore saplings today." One crore is 10 million.