When it comes to saving the planet, the ambition of India’s reach is praiseworthy. The challenge lies in the weakness of its grasp.

After emphasizing for years that a pathway to going green was more important than a deadline, India surprised delegates at the COP26 climate summit in Glasgow by announcing a net zero goal for emissions by 2070. More onerous than that longer-term commitment is the intention to use nonfossil-fuel sources for half of its energy needs by 2030.

It’s a daunting target. The share of renewables in the country’s current energy mix is only 12%. Besides, the third-largest emitter would guzzle 2.5 trillion kilowatt-hours of electricity annually by 2030, almost double what it required at the start of the decade.