Saying that we need to take care of the plants and animals in danger of extinction is not only because it can be that many of these species have a particular beauty and help make the planet a place more beautiful, but that there are many other benefits.
For example, at this very moment many plants and animals help us facilitate our existence with services like for example clean air and help reduce environmental pollution, regulating the greenhouse effect and the climatic conditions, natural on pest control in our crops and help control the growth of species with playback speed much more fast, as for example the rats that carry diseases.
Even species that today are in danger, can bring many benefits in the future, as had happened with plants that today are not and would have been ideal to create new plants more resistant to the current weather conditions.