HUMAN EVOLUTION. IS IT GOOD OR BAD? Millions of years ago, hominid, the first ever species had walked on two feet on the ground started a significant evolution had never seen in the history of our planet: human evolution. During the course of evolution, our ancestors developed new hunting techniques, hence, they had more food to eat that made their brains grow larger as they became more intelligent. They started to create and explore new things, and fire was the most valuable invention of human evolution. Cooking made food softer and digestion easier which explained in reducing in size and length of jar and teeth, but increasing in size of brain. Indeed, fire wasn’t only used for cooking food, but marked another step toward the evolution: society. They gathered around fireplace and developed social behaviors. Those were early stages of the society that hundreds of thousands of years later had their own tribes and languages. And now in the twenty first century, we known as human, a superior species on Earth. That must have been a tremendous achievement of our evolution, nevertheless, that has put a huge impact on the environment in the way that no other species have ever done that before even our ancestors. In the last couple of decades, we pump billions of tons of carbon dioxide into the atmosphere and dispose hundreds of millions of tons of toxic chemicals into the environment. Additionally, we are in charge of making millions of acres of forest vanishing every year. As a result, global warming, sea level rise, and natural disasters are signs that indicate our ecosystem can’t bear any longer. We human need to do something to stop those from becoming worse. Remember we’re tightly connected to other species and the environment, no matter how advanced and intelligent we are if we break the balance in our biosphere, we’re putting an end to our species!