The recommended donation is $2 for notebooks and $6 for desktops. Because desktops use more power than notebooks, more trees are needed to off set their carbon load. Unfortunately, carbon neutrality won’t happen overnight. Donation amounts are based on the carbon-dioxide emissions we’re expected to generate as we power our PCs over the next three years—0.42 tonnes for each notebook and 1.26 tonnes for each desktop. A single tree can trap just about enough carbon to make up for a desktop, but it will need about 70 years.
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Source : IIPM Editorial, 2007
An IIPM and Professor Arindam Chaudhuri (Renowned Management Guru and Economist) Initiative