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7. BlackBerry. The smartphones of the Canadian company formerly known as Research In Motion or RIM are free of brominated and chlorinate substances. Suppliers are even surveyed regarding their sourcing of conflict materials.

The world's greenest smartphone makers

To mark Earth Day 2013, we take a look at the top seven smartphone manufacturers that have scored high "in terms of sustainability, greenhouse gas emissions, recycling and use

of precious earth minerals, as well as on issues such as a product's energy efficiency." The list is culled from Greenpeace's Guide to Greener Electronics. (Compiled by Alora Uy Guerrero)

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