Discussing causes - 1 - revised

In our life, there has been a huge increase in population in our life over the past 150 years. Why did this thing happen? What kind of reason can make it become such a huge change? I think that it is a good question to be explained. I think there are a lot of questions we can be searched. First of all, I think there are so many advances in medicine and health care now that it has made a great difference from before. The century advancement makes medical treatment more progress, and cures more people. Second, the better sanitation also makes this world clear. The personal accomplishment is better than before. People would pick up the garbage on the ground and put into trash cans. Third, people improved farming methods that produce more corps which make us eat healthier. Last but not the least, fewer infants die and more people live longer. Because of people’s efforts, there are a lot of changes to different kinds of areas such as food and sanitation. As a result, we have to treasure all the things we have. And I am glad to see the changing of world.