Carbon dioxide (CO2) is a transparent and odourless gas generated when we burn fuel. A carbon credit represents a tonne of CO2 that has been removed from the atmosphere or not been emitted in the first place, but because it's a gas, it's hard to imagine. We can think of balloons easily enough however, and a fully inflated party balloon holds about 50 g (2 oz) of CO2. There are 20,000 balloons for each tonne of CO2. The nice feature of balloons is that we can easily see our emissions from everyday actions, as this video shows. The performers are students from Li Po Chun United World College for a presentation Teng Hoi was invited to deliver by the American Club in Hong Kong.
Ballooning emissions
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