Carbon dioxide is for suckers. If you really want to do some damage to the environment, sulfur hexaflouride is where it's at. According to Pollution Online (which, despite its name, is actually against pollution), one pound of SF6 has the same potential global-warming impact as 11 tons of CO2. Sulfur hexaflouride is used in high-voltage electrical equipment. If inhaled, it acts like antihelium, and, according to Wikipedia, makes one "sound like the god of hellfire." Finally, this dangerous (and potentially hilarious) gas is odorless, colorless, nontoxic, nonflammable, and extremely difficult to detect.
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