1,The Earth is the only home we have, so we must protect her.
2,We must protect our only home--the Earth.
3,We must protect the Earth, which is our only home.
4,It is the Earth that we must protect because it is our only home
5,We have but one home--the earth--we must protect her.
6,We must protect the Earth because it is our only home.
7,We have only one Earth as our home.We must protect her.
8,As the only home we have, the Earth must be protected.
9,The earth must be protected because it is our only home.
10.To protect the Earth is to protect our home, and it is our only home.
