My carbon or yours?

So our water district staff presented how they thought we could reach carbon neutrality by 2020. Depending on how you do the numbers, we became carbon neutral without even trying. A lot depends on this: ( Full presentation via scrolling to March 26 2013, Item 4.1) That’s how much energy’s used to cradle-to-grave a water drop from the Sierras to the outflow of a wastewater treatment plant

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My carbon or yours?