If it's nontoxic:
A. Dig a hole in the back yard, put it in, whisper a message of unmaking and new life, add some rich compost, plant a tree.
or
B. Put it through a shredder, give it a thousand scissors cuts, slice it with a really sharp knife or rip it to shreds with your bare hands. Then put it in your worm compost bin.

If it's toxic:
Label it, in big big letters, "CAUTION! TOXIC MATERIALS FOR PROFESSIONAL DISPOSAL." Call your local toxic waste disposal unit, make an appointment, go there with friends all dressed in black or in cleanup suites, and solemnly turn it over to the cleanup professionals/priestly caste. Chant while doing this.

-- Love doesn't just sit there like a stone; it has to be made, like bread, remade all the time, made new. --Ursula LeGuin