adequate /ˈædɪkwət/ adjective = enough or satisfactory for a particular purpose EXAMPLE: The amount of water supplied was adequate throughout the period.

conservation /ˌkɑːnsərˈveɪʃn/ noun = protection and careful management of natural resources, wildlife, and the environment EXAMPLE Environmental conservation is essential for sustainable development.

unavoidable /ˌʌnəˈvɔɪdəbəl/ adjective = cannot be prevented or avoided EXAMPLE: Environmental damage is often an unavoidable consequence of industrial development.

redundancy /rɪˈdʌndənsi/ noun = Unnecessary repetition EXAMPLE Eliminating redundancy in administrative processes can increase efficiency.

restrain /rɪˈstreɪn/ verb = prevent something from growing or spreading EXAMPLE : The graph shows how spending was restrained during economic recession.