Pranab Mukherjee, India’s new President, is likely to continue the legacy of natural-resource efficiency at Rashtrapati Bhavan that began with A.P.J. Abdul Kalam. In 2003, the nuclear scientist espoused rainwater harvesting. Under Pratibha Patil, Kalam’s successor, the official premises were powered by solar energy. And even before Mukherjee assumed office, water supply and treatment had received a boost. New York-based Xylem Water Solutions plans to make water utilisation at Rashtrapati Bhavan greener and more efficient. No sweat. As the former finance minister, Mukherjee knows all about efficiently managing liquidity.