Today s massive and rapidly growing human population is capable of much greater damage. As population increases more species decreases. Human beings are the sole species, which are able to cause a mass extinction of many other species. Human activities, including the clearing of forests, the spread of agriculture, illegal hunting for animals under protection, the pollution of water, air, and soil caused the extinction of the last several thousands of years. As I motivated above if the human population grows and human activities increase, the problem will become more serious.
More people require more food and more space to live, and they create more waste.
Beside our experiments we should not forget that we are the sole species who are able to save others. The existence of animals has several important advantages. When human beings first appeared on Earth about two million years ago, they lived in a biologically rich world, on the boasted millions of other species, including plants, animals, fungi, and microorganisms. Even those early people must have appreciated the natural beauty of living things around them, from individual species such as colorful birds to elegant combinations of species in the form of meadows, forests, and desert landscapes. Our ancestors drew picture of the animals and plants around them, and evidence suggests that those prehistoric people used animals and plants in their rituals.