<Li> Operational <Ul> <Li> Risks such as higher costs for freshwater due to scarcity or lower output for hydroelectric facilities due to siltation </Li> <Li> Opportunities such as increasing water - use efficiency or building an on - site wetland to circumvent the need for new water treatment infrastructure </Li> </Ul> </Li> <Ul> <Li> Risks such as higher costs for freshwater due to scarcity or lower output for hydroelectric facilities due to siltation </Li> <Li> Opportunities such as increasing water - use efficiency or building an on - site wetland to circumvent the need for new water treatment infrastructure </Li> </Ul> <Li> Risks such as higher costs for freshwater due to scarcity or lower output for hydroelectric facilities due to siltation </Li> <Li> Opportunities such as increasing water - use efficiency or building an on - site wetland to circumvent the need for new water treatment infrastructure </Li>

Why are coral reefs such a vital ecosystem briefly discuss their ecological and economic benefits