The percentage of electronics at the end of their lives which were recycled.
The EPA found that the percentage remained consistent from 1999-2005. Even as recycling rates went up, the amount of electronics reaching end of life outpaced the increase, leaving the figure static. (source: EPA, July 2008)
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Seems like a lot of people are missing one important difference between the formats which is behind the higher sales for HD-DVD of Planet Earth; HD-DVD players currently have no region coding so the US Planet Earth disc can be bought say for playback in Europe for example, whereas the Blu-ray version and players are region coded therefore the Blu-Ray version is US only.
tonyb
"HD-DVD players currently have no region coding so the US Planet Earth disc can be bought say for playback in Europe for example, whereas the Blu-ray version and players are region coded therefore the Blu-Ray version is US only. "
The Blu-ray version of Planet Earth is not region coded - just as any other Warner title (and Paramount titles + many catalog titles from Sony, Disney, Lionsgate).