The estimated percentage of cellphones that were recycled in 2007.
The EPA estimated that of the 126.3 million cellphones disposed of in 2007, only 14 million -- about 10 percent -- were recycled. The rest? Landfill heaven. (source: EPA, July 2008)
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Actually the spectrum comparison between WiMAX and LTE is flawed. Both technologies are similar in so many ways, WiMAX is a more real technology in the sense that commercial products are available when compared to LTE.
Today its established that WiMAX is primarily running in the 2.5GHz and 3.5GHz bands, meanwhile LTE is still not as decided and looks like most LTE operators will either utilize the 2.5GHz band or refarm their 900MHz spectrum.
Having said that, its true that low frequency bands such as the 900MHz or the newly opened 700MHz offer better RF propagation but in the same time these band are limited in the number of available carriers, GSM900 carrier is 200kHz while LTE is looking at carriers of 10MHz and 20MHz to deliver the promised high throughput. 3G had to be moved up to the 2.1GHz for similar reasons.
From other points of view, both LTE and WiMAX adopt OFDMA which has better spectral efficiency and an all-IP architecture which means that an upgrade from 3G to LTE is as complicated as from 3G to WiMAX, it remains to see if WiMAX gathers enough supporter from equipment manufacturers which today is a losing struggle for WiMAX.