The planet where we live called “Earth” is beautiful and one of a kind in the spacious universe. It is livable and bursting with the animated. So far, it is the only one of celestial bodies found which has the existence of lives. It seems that Earth is so precious that we should cherish it greatly. Nevertheless, people take its value for granted and have been damaging the ecology. Now, Earth has been sick. The sky full of exhaust gas is not splendidly blue as ever and water becomes dirty and undrinkable owing to the discharge of waste. Above all, the emission of greenhouse gas changes the climate and global temperature. Temperature becomes higher by degrees, which brings about the rise of the level of the sea, the extreme difference between the cold and the hot and the melting of icebergs situated at the Arctic and the Antarctic and so on. The phenomenon of the temperature's rising called global warming leads to the fierce variation of climate. If we let global warming proceed, the only environment where we can live may disappear. To prevent from the nightmare, we have to take some measures. Although the civilians’ effort is limited, there are still some duties we should be responsible for. First, we can usually take public transportation in place of personal cars. Transportations discharge a large amount of green house gas. However, by taking public transportations such as buses and the MRT, the number of cars decreases with the result of reducing the discharge of exhaust gas. Second, being on a vegetarian diet is also beneficial for preventing global warming. According to research, animal husbandry does ecology harm, for livestock discharge greenhouse gas when farting. With the population growth, the need for granary also increases, inclusive of meat. In consequence, the breadth of husbandry extends which even leads to the destruction of environment like oases and desert's extension. This is why more and more people with the consciousness of environmental protection become vegetarians. Third, recycling the resource made from logs can be helpful for decreasing greenhouse gas. The logs are lumbered form forests which are in charge of absorbing carbon dioxide which is a murderer causing global warming and even turns carbon dioxide into oxygen which is the significant material for breathing. Rainforests also called “lung of the global “play an important role in circulation of gas. However, rainforests disappear about several football fields every day. Therefore, the recycled logs can replace the ones in rainforests which may be lumbered to use. Last, we have to cut down on the use of oil and coal, but we still need energy for life; therefore, the new energy should be developed. Among all energy, solar energy is least polluted, but we are still not able to turn the sun's rays into energy completely. The coming destination is to make use of solar energy efficiently. Earth is part of not only us in contemporary age but people in the future. We cannot be so selfish that we waste and destroy the resource at will. Protecting Earth is the task that we all should be responsible for.