India's drive to blend more biofuels with petrol has helped the country cut millions of tonnes of carbon dioxide emissions and save precious dollar reserves.
But it has also sparked worries among vehicle owners and food policy experts about its potential impact on fuel efficiency and food security.
Last month, India achieved its objective of blending 20% ethanol with petrol, known as E20, five years ahead of its target.
The government views this as a game changer in reducing carbon emissions and trimming oil imports. Since 2014, ethanol blending has helped India cut 69.8 million tonnes of carbon dioxide emissions and saved 1.36 trillion rupees ($1.5 bn; £1.1 bn) in foreign exchange.
A study by Delhi-based think tank Council on Energy, Environment and Water (CEEW) shows that carbon dioxide emissions from road transport in India will nearly double by 2050.
