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9. CFCs<br />

10. Plastic Grocery Bags<br />

Short for chlorofluorocarbons, CFCs are nasty chemical compounds that wreak havoc on the<br />

environment. Used in refrigeration units and aerosol cans, CFCs combine with atmospheric ozone,<br />

neutralizing the molecular compound and weakening the ozone layer, an important environmental<br />

barrier that protects the earth's surface from ultraviolet radiation from the sun. While increased<br />

regulation since the 1970s has diminished their use, CFCs can endure in the atmosphere for nearly<br />

a century, making this a very long-lived mistake.<br />

According to their Material Safety Data Sheets, CFCs and HCFCs are colourless, volatile, relatively<br />

non-toxic liquids and gases with a faintly sweet ethereal odour. Overexposure may cause dizziness,<br />

loss of concentration, Central Nervous System depression and/or cardiac arrhythmia. Vapors<br />

displace air and can cause asphyxiation in confined spaces. Although non-flammable, their<br />

combustion products include hydrofluoric acid, phosgene, and related species.<br />

Touted as a convenient and cheap alternative to paper bags, plastic grocery bags gained acceptance<br />

in the late 1970s and now meet 80% of retailers' bagging needs. They've saved millions of trees<br />

but come with equally bad consequences: more than 500 million are used and discarded each year,<br />

millions of which never make it to a landfill and fall as litter. And depending on the plastic used in<br />

production, those bags may take several hundred years to decompose. The solution? Recycle, or<br />

better yet, skip both paper and plastic and bring a reusable bag of your own.<br />

11. Cigarettes<br />

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