There are five species of rhinoceroses in the world, which are the white rhinoceros, black rhinoceros, Indian rhinoceros, Javan rhinoceros, and Sumatran rhinoceros. The total population of all rhinoceros species is estimated to be around 27,000 individuals. However, due to poaching and habitat loss, the number of rhinoceroses is declining rapidly, making them critically endangered. Efforts are being made to protect and conserve these magnificent creatures to ensure their survival for future generations. **

It is difficult to predict an exact world population at which overpopulation would cause the Earth to collapse, as it depends on a variety of factors such as technological advancements, resource management, and environmental sustainability. However, it is important to note that overpopulation is not just about the number of people, but also about how resources are managed and distributed. With proper planning and sustainable practices, it is possible for the Earth to support a larger population. Therefore, it is crucial for us to focus on sustainable development and responsible resource management to ensure a balanced and healthy planet for future generations. **