Unless you're holding out for a smelly sneaker contest, donate your outgrown or old sneakers to a program that recycles them. The rubber used to make sneaker soles is incredibly useful. Companies such as Nike operate national programs that will grind up the soles, and then re-form them into flooring or surfaces for sporting venues.
If every high school student who plays basketball in America were to donate a pair of sneakers to a recycling program, the resulting material would be enough to create a new basketball court floor for every high school in the state of Indiana-and a few for neighboring high schools in Illinois, too.　
Exposure to dangerous chemicals adds up over time. This term refers to just that-the gradual buildup, in an organism, of a substance that is not easily metabolized and eliminated. Toxic chemicals such as dioxins can bioaccumulate in the systems of cattle, fish, and chicken, for example, and enter the systems of humans when they digest these foods. In a human, repeated exposure to toxins considered safe in small amounts can bioaccumulate and may become hazardous to one's health.
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