How can my family reduce the amount of carbon dioxide in the air?

It's a science assignment I have to do... so far, all I have is carpooling and planting more trees, and encouraging others to do so. I need 7 in total, and I need to explain WHY this gets rid of carbon dioxide in the air. I've been racking my brain for hours, and it's now 2 hours past my usual... show more It's a science assignment I have to do... so far, all I have is carpooling and planting more trees, and encouraging others to do so. I need 7 in total, and I need to explain WHY this gets rid of carbon dioxide in the air. I've been racking my brain for hours, and it's now 2 hours past my usual bedtime...help please?
Thanks =]
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