Do you leave the tap running when you brush your teeth?
If you answer the answer, which means you are not caring about the earth then you let a little bit of air in. If it's the opposite you let a little bit out. By the end of the questions your balloon shows how much it has decreased or increased.
What happened to my earth/balloon? The balloon had gotten smaller. What is one thing we could do to change our behaviour? Stop wrapping my lunch in glad wrap.
Here are some photos before and after:
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