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If I hunt 20 days in the winter that is at 80 of them I am tossing in a landfill.
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They are charcoal, iron, cellulose with a bit of water and salt. You can dump them on the ground and enrich the soil with them - no need for the landfill except for the pouch and packaging.
http://cen.acs.org/articles/88/i4/Hand-Warmers.html