Scientists at the University of Cambridge (England) have developed a method using lasers to remove the toner from a laser printed page, which would allow the paper to be reused. With the "unprinter," a green laser is flashed at the page. This does not harm the paper, but the light is absorbed by the toner, causing it to detach from the paper.
Because of the difference in technology between laser printing, where the toner sits on top of the paper and is fused to it by heat, and inkjet printing, where some of the dye is absorbed by the paper, it probably would not work (or would work less well) with inkjet printing.
As noted on Slashdot, "Recycling paper is a good step in the right direction, but it still pales in comparison to unprinting. In a worst-case scenario, The University of Cambridge unprinting method has half the carbon emissions of recycling; best-case, unprinting is almost 20 times as efficient."
written by Be Green, March 16, 2012
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