Uploaded on 2018-10-26 by Silvan Li

As we can see from the picture, electric cables are carry on the street with hugh giant tree log. This is very common and popular approach in city of Los Angeles. However, the weather here is not as bad as other places on the planet. Therefore, not as often these cable are mufunction or falls down. however, the water is carry underground inside of big metal tube which is definitely very important, because water is much more easy to get contaminated if its being travel aboveground. According to projection, within the next couple years, more than half the world’s population will be living in urban areas. Our human’s development and interactions have affected our earth’s natural systems. Historically, just 200 years ago, only 2% of the world’s populations are living in urban areas. However, due to increased density of populations in urban areas, some city were some of the unhealthiest places to live which also led to higher death rates than in the countryside. Nowadays, in some developing country, pollutions are so terrible.