... Cluster #8 is consistent with our searching keyword, and this cluster reflects the objects, indicators, purposes, and methods of this type of research (Table 7). (45,20); climate (41,45); river basin (36,48); energy food nexus (26,27); sustainable development goals (22,47); opportunity (16,27); system dynamics (12,18); river (12,22); hydropower (12,30); tradeoffs (10,27); conservation (8,15); synergy effect (6,18); integrated assessment (6, 13); future (5, 13); resilience (4,12); political economy (4,9) #1 renewable energy water (48,26); energy (42,36); system performance (27,29); politics (18,30); circular economy (15,32); simulation (12,35); efficiency (10,26); biodiversity (10,25); anaerobic digestion (9, 25); desalination (4, 10); economic growth ( (12,26); ecological systems (9, 24); infrastructure (8,21); networks and flows (7,20); environmental policy (6,14); climate change impact (5, 10); sustainability science (4,9) #5 optimization water footprint (36,30); allocation (12,14); optimal design (9, 21); optimization model (9, 25); decision (8,24); use efficiency (7, 12); sensitivity analysis (5, 11); sustainability assessment (5, 10); surface water (5, 17); multi-objective optimization (4, 10); protection (4, 6); environmental sustainability (4, 10) ...