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Apple isn't the greenest company on the planet -- but it's constantly making improvements.

The company's latest step is this week's announcement of its "cleanest" iPod yet, the newest version of the iPod nano. The device is manufactured with arsenic-free glass; contains no Brominated Flame Retardants (BFR), mercury or PVC; and is said to be highly recyclable because it is made with aluminum and glass.

"We want to be just really environmentally sensitive with these products. We ship a lot of them," said Apple CEO Steve Jobs. "We're constantly worried about reducing the size of the packaging and the transportation carbon that we spend to move these around the world. But the biggest thing we worry about are the toxics."

Greenpeace has long criticized Apple for not being environmentally friendly enough (see their old "Green My Apple" campaign, a name Apple itself has co-opted to embody its environmental mission). But the environmental group praised Apple's announcement, while also calling on Apple to continue to go greener with their computers and iPhones.

The new fourth-generation iPod nano will be available this month in two models: 8GB for $149, and 16GB for $199. Macworld has a complete review.