From the Future is Wild which type of environment and animals will dominant earth next? Explain your reasoning

I think that the next thing that would happen to our world is either the ice age or our world would be covered in water .I think that in order to balance the world to the state it once was the planet would create another iceage of undo all the bad things we have done to our atmosphere.And to freeze up the water we have melted .Or the world would just flood and we would all become like fishlike beings (mermaids) and once land start to reappear we would start to adapt to land again