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Date: 2010-02-09 02:02 (UTC)From:http://blog.greenfeet.com/index.php/paper-vs-plastic-the-shopping-bag-debate/reducing-your-footprint/121
says bags mostly come from natural gas, actually, perhaps a more natural feedstock for polyethylene. And "natural gas" mostly means methane, which has lots of biogenic sources. [Though Wikipedia suggests ethene does come mostly from oil cracking.] It also says paper bags take 50x the water to produce, and that plastic grocery bags go back to 1977. Huh, younger than me. (But wikipedia says 1965, with the patent overturned in 1977. Okay, two facts disputed, that's a bad sign.)
http://www.reusablebags.com/facts.php?id=7
91% less energy to recycle plastic, when people bother.
Though the BTU figures look more like 99% less energy.
Reusable bags would be better, but no, I don't remember them nor carry them around casually, and a lot of my shopping is as I pass the store.