Answer:
The carbon cycle is important because when you inhale, you're inhaling oxygen, when you're exhaling you're letting out carbon dioxide. Now the trees help this because the trees and plants produce oxygen, so that's what we breathe in, and carbon dioxide is what the trees and plants breathe in. So it all works out well.
Without the plants producing oxygen and us producing carbon dioxide, the whole air and atmosphere would be messed up, that is why it is so important that the carbon cycle is in balance because if it wasn't we would die and the plants would die.
