He made it beautiful, happy and green. There were large green fields with grass and colourful flowers. Then God made birds and animals to live in the meadows and the fields, the woods and the forests.
After that God created Man to take care of his beautiful creations. He made Man as the most intelligent and best of all his creations.
But then, God had some doubt in his mind. He wondered if Man would really take good care of his creations. So he warned Man, "You must keep earth as green and as beautiful as I have created it. Do not commit any sin when you go to Earth. Or as a punishment the earth will lose its beauty and will turn into a vast desert."
Soon Man forgot God's warning. He started stealing, lying and committing other sins. So Earth turned into a vast desert.
But when Man realized his mistake, then God forgave him. That is why there is still some greenery left on the Earth yet.