If you're one of those people who are concerned about the carbon footprint you leave on the planet, you'll be happy to hear, for a mere dollar, you can offset the CO2 emissionsfrom your iPhone 4, for your whole life.
You can deduct it from your taxes, and can be donated through PayPal.
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Of course, one should consider how long is the life of the iPhone 4, exactly? Will we have to shell out another dollar or more when the iPhone 5 comes out in a few months?