The world is overpopulated. Humans have already eliminated as many species as other great extinction events. Our industrial activity has changed the Earth climate. There is very little wilderness left anywhere. The forests are getting clear cut and eliminated. We have exceeded the Earth's capacity to support us already and there is no end in sight, unfortunately. Humans are the disease and unless we learn to live sustainably (as opposed to infinite expansion), the life is going to get worse for every subsequent generation and we are toast in the end.