“…Its other objective is to reduce GHG and slow-down of depletion of fossil carbon. The main feedstocks for biorefinery include perennial grasses, starchy crops (wheat and maize), sugary crops (beet and cane), lignocellulosic or energy crops (switchgrass, miscanthus, willow, short rotation coppice, and poplar), lignocellulosic residues (stover and straw), oil crops (palm oil and rapeseed oil), aquatic biomass (algae, micro-organisms and seaweeds), agricultural, forest, and industrial residues (bagasse, forest thinning, stover, straws, sawdust, and paper mill waste), and consumer-generated kitchen waste (Pandey et al 2015 ; Kamm et al 2016 ; Lago et al 2018 ; Bhaskar et al 2020 ). Sustainable conversion of biopolymers such as cellulose, chitin, and chitosan-based products using (nano)-catalysis into valuable products as against fossil-fuel industry is critically analyzed (Varma 2019 ).…”