Just don't take a breath to make up for it.<p>For comparison to the 1g CO2 per search:<p><pre><code> - One breath: 0.001g
- One hour of a 60 watt bulb: 0.060kg
- One gallon gasoline burned: 8.9kg
- One hour of El Chinyero vent: 90000kg
</code></pre>
(Note, it's late, so I may have screwed up some of the calculations between pounds, hours, and other imperial units)