How Long Does It Last?

How long will each of these pieces of trash last for if they are left to decompose or photo degrade (plastics photo degrade by slowly being broken down by the sun's rays) on the trail? This information is taken from a USDA Forest Service study that averaged out the time of each piece of litter in various environments (desert, mountain, beach, forest, etc....).

Theresa Beezley
On Sep 7, 2015
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How long will it take for paper to decompose?