In contrast with many home appliances, life cycle energy use of a computer is dominated by production (80%) as opposed to operation (20%). Extension of usable lifespan (e.g. by reselling or upgrading) is thus a promising approach to mitigating energy impacts, as well as other environmental burdens associated with manufacturing and disposal.
The original text is here:- www.it-environment.org/about%20project%20-%20LCA%20of%20IT%20hardware.htm
Donate your computers for reuse at www.pcrecycler.co.uk