https://www.google.com/url?q=http://www.upi.com/Science_News/2013/02/13/Company-debuts-green-hard-hat/UPI-97111360793657/&sa=U&ei=7Lw6UbfcK5Oc8QTPsYD4DA&ved=0CCIQFjAJOBQ&sig2=sGhVJqh_MUjJaD2lEme-GQ&usg=AFQjCNFy–D_i5o0PnrMXEYXDDV4kGNyjw

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