Richard's already done the funny, so I'll say just from your guilt you have learn't to question your actions which will end up saving the environment to a far greater affect than if you didn't spray it and continued on with life.
People have to realise their actions can save many times more than their life time will use, they just need to think "outside the square".
Before the late 80's it was probably CFC's, after, then it was HFC's, which contribute to the greenhouse effect instead.
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"Natural climate forces can not be underestimated, but no climate model produced can show the speed of the melting in the Arctic that has occurred without adding human contributed emissions." A Physicist from the U.S Army.
http://www.theage.com.au/frontpage/2.../frontpage.pdf
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