this feels like something similar to mine. the humans leaving earth after they realized what they have done and in my head,the animals are just as smart as humans.the humans leave and vow to never return,much to the earth's pain,
in my head,the earthquakes,stunamis,tornadoes and other natural disasters are really the earth...crying out in pain.the animals take the huamns' leaving very hard,they want to help them understand that they can rebuild but the humans are too heart-broken to listen and leave earth.
the ending's happy,because the animals were able to bring the humans back to the earth after hearing their pleas and desire to help them. thus the earth enters an era of peace and unity