The estimate is based on the cumulative, servers, cooling systems, fixed- and mobile-phone systems, local-area networks, office telecommunications and printers use within the world's offices.
The estimate also includes all commercial and governmental IT, as well as telecommunications infrastructures worldwide, but it does not include consumer electronics other than cell phones and personal computers.
Simon Mingay, research vice president at Gartner, said technology companies will face increasing financial, environmental and legislative pressures to over the next five years.
Fewalready in place, and they have not mapped out the impact of the business' activities on the environment, Mingay added.
And the people buying technology for businesses do not fully understand the environmental impact and life cycles of products and services because of a lack of commercial and legislative incentives, according to Garter.
But. Garter predicts that more than a third of IT organizations will have one or more environmental criteria in their top six buying conditions by 2010.
Reducing energy consumption and the use of hazardous substances throughout the life cycle of a product or service, and upping recycling efforts, are key areas to, Gartner said.
Gemma Simpson of Silicon.com reported from London.