주제 : 인간의 활동은 지구를 더 발전시켰다는 진술
Developing many inventions has some problems. We has wiped out a lot of trees for industrialization and urbanization. Tree absorbs CO2 and emits oxygen. Without many trees CO2 is abundant in cities. Because CO2 is a one of greenhouse gas, the temperature of our planet gradually rise. But I think human activities have more advantages than disadvantages.
First, We can save a lot of time. To be specific telephone is very convenient invention in our life. Before developing this novelty people expressed their opinion or informed some events in person. It is so physically demanding and time-consuming. Because they usually visited person who live far apart from them by riding horse. In contrast now all you need is pressing some buttons. It is also easy to use. Although people you want communicate with isn't there you don't need to care. It is possible to leave a message.
Second, we can live longer than before. People had lived for 30 years at most. That's because they are vulnerable to germ and virus. Because we develop medical science now we can get a lot of drug and surgeries easily. Moreover the doctors know our body and mechanism well. Today medical insurance is so well-developed we can cure our illness cheaply or for free. From my experience my grand mother died when she was 90 years old. 90years is three times as many as ancient people's life span, 30years. Some elder people say that they get tired of living for a long time in joke.
In conclusion for these reasons, I think human activities have enhanced and improved the Earth. That's because development ensures that we save time and we have longer life span. We have to study hard and research for better our lives.