Who was GD Agrawal, activist who died while fasting for Ganga?

Activist and former IIT professor GD Agrawal, who passed away during his 'fast unto death' for clean Ganga river, was a PhD scholar in Environmental Engineering from California University. The 86-year-old activist was part of many protests and sat on several fasts to conserve the river. In 2011, he became a 'sanyasi' and adopted the name Swami Gyan Swaroop Sanand.