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Greenhouse
Earth
 What
happens when you go into a greenhouse on a sunny day? It's hot, isn't it?
That's because the glass in the greenhouse traps the heat from the sun.
This gas carbon dioxide
does the same in the earth's atmosphere. It acts
like glass in a greenhouse, doing the same as my feathers do when I'm swimming
in the very cold sea: my feathers keep me warm, the glass in the greenhouse
keeps the plants inside warm, and the carbon dioxide keeps the planet warm.
Without it, we'd freeze. Too much of it means that we boil!  Because
people are burning fuels with carbon in (that's oil, gas and coal which
you use in cars, aeroplanes, power stations and so on), all this carbon
gets dumped into the air, mixed with the oxygen we all breathe, and so adds
to our greenhouse gas problem. And the planet warms some more.
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