1Energy and Wetlands Research Group, Centre for Ecological Sciences [CES], 2Centre for Sustainable Technologies (astra), 3Centre for Infrastructure, Sustainable Transport and Urban Planning [CiSTUP], Indian Institute of Science, Bangalore – 560012, India, 4Department of Applied Geology, Kuvempu University, Shimoga 577471, India *Corresponding author:tvr@iisc.ac.in