All around the world, energy is wasted so I decided that I will help to protect the environment. While moving to another class to study, I noticed a plastic bag on the floor. "I must put it into the trash can"- I thought to myself. After doing that, I feel happier for nothing. When we think about energy, we are think about fossil fuel of coal but when I'm thinking about energy, i am thinking about solar because we just need solar engine and the sun. And if we use solar energy, so it will be better . If it's not enough energy so we must pay for energy but it's much cheaper than the normal energy that we often use. Most of eletricity that we use is made of fossil fuel and coal. I'm not the one who only thinking about  solar energy. In Da Nang, people also thinking about that and even they use that energy at school.