A few days back, All Tech got a question from an NPR listener that got us curious. Tim Callahan from Seattle wrote: "A friend asked how texting - in all its forms (admittedly a squishy thing to corral) - is contributing to global warming? After saying, 'minimally...', I thought about how to answer that question. Putting aside the sunk contribution caused by the manufacture and transport of the device you text with, how much does the battery emit / generate while a person does a typical or somehow average text? ... Can you help quantify?" I tracked down someone who'd get us to the answer: greenhouse gas foot printing expert Mike Berners-Lee. Climate impact calculations are just the sort of thing he does for work at Small World Consulting at Lancaster University in the United Kingdom. And estimating the impact of a text message is exactly the thing he did for his 2010 book How Bad Are Bananas? The Carbon Footprint Of Everything. Read More at www.npr.org