According to our textbook, around 2050 we will be nine billion people. And for a change, I could say that it's not about giving up something, but about changing our behavior. Spending less time in the shower, washing dishes in the washing machine, cleaning the car with shampoo, using rainwater to clean the floor at home and many other actions would save a huge amount of water. Another point we must consider is that all these changes do not require special efforts but only a new approach to the environment and ecosystem resources. The balance between personal choices and environmental considerations can sometimes be difficult because we are used to getting so much from Nature; and for free. So, changing such a situation is not as easy as we might imagine. Unfortunately, how we manage ecosystem resources is part of our culture, our social behavior and our educational process. It is difficult to prove to someone that their action can have a serious impact on the planet. In fact, we, at least most of us, have individual thinking and do not take the whole world into consideration. A friend of mine recently told me he couldn't