Subscript/Superscript Line Spacing

I've been using the <sub></sub> and <sup></sup> tags to put a few numbers and words into subscript or superscript (ie. in order to write CO2 properly).<br />
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The problem is that when I put the '2' into subscipt, for example, it will increase the spacing between this line and the next very slightly. This spoils the appearances of the page.<br />
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Is there any way of either stopping this slight increase in line spacing, or increasing the line spacing of the rest of the page in order to match it?<br />
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Thanks.<!--content--><span style="margin-top: 2px">The text below</span><br />
or<br />
<span style="margin-bottom:-2px;">The text above</span><!--content-->
 
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