Obsolescence n. : The state of becoming obsolete.

Example:
What are the environmental impacts of hardware Obsolescence?

Taxonomy
obsolescence, product, planned obsolescence, Technical obsolescence, Obsolescence management, Functional obsolescence, physical assets, facility, replacement parts, obsolete products, technology, Depreciation, new technology, Postponement, Unanswered questions, Insurance Dictionary, Real Estate Dictionary, Economics Dictionary.

Defination from the web:
obsolescence ( ′äbsə′lesəns ) ( engineering ) Decreasing value of functional and physical assets or value of a product or facility from technological ... Look up obsolescence or obsolete in Wiktionary, the free dictionary. ...