Aftertime The Earth will be habitable after the cataclysms, and this is why the human species has continued through previous cataclysms.
Life is rough, and life is short.
The infant mortality is horrific. The strong survive, and where there is communal cooperation among caring people, the odds are not really that bad. Habitability varies, depending on location. The poles shift, the winds shift, volcanic eruptions continue from activated volcanoes that take some time to settle down. The rains seem continuous, but plant life does not mind this as much as the mammals trying to get dry.