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More and more people move from the countryside to big cities. Does this development bring more advantages or disadvantages to the environment?

Introduction

With the increasing population shifting from rural to urban areas, an array of hazards have been brought to the natural environment.

解析

老题新改，城市化话题，但要求利弊全都只能写对“环境”的影响。细想这个题，有点难度。

Ø hazard n.[C] 害处

Body 1

Of all the detriments to the environment, the most conspicuous one is the urban heat island effect, which means a city or metropolitan area that is significantly warmer than its surrounding rural areas due to human activities. To illustrate, as the population density is getting higher in urban areas, human activities wreak havoc on the environment. For example, more vehicles, factories, and domestic heating and cooling units not only release more heat but also discharge more contaminants amassing above cities, rendering the air saturated with harmful chemicals, dust, and other pollutants. // Additionally, with an increasing number of people migrating to cities, public parks and green lands need to be converted into residential areas for the surging demand for housing. The less the greenery is in cities, the severer the pollution is.

解析

(1) 城市化 → 人类活动