We can thank the Moon for predictable weather, ocean currents and the circulation of important nutrients. The Moon also helps stabilize the Earth's tilt. Take away the Moon, and the Earth would go wobbling all over the place. And it would cause what I can only describe as climate change on steroids.
Imagine if one day you looked up into the night sky, and saw Mars or Saturn where the Moon was supposed to be. That would sure turn our Earth into an alien world. And not just because of the new view.
How would replacing the Moon change the Earth's orbit?
What planet could we safely replace our Moon with?
And what planet would be the most disastrous?