There are many factors(因素) that can affect climate change. Among these, the population movement is a new one. A research shows us that the movement of many people out of Beijing for the Chinese New Year(CNY) causes the temperature to drop slightly(轻微地). Before holidays, people around Beijing all gather(聚集) here. Besides, buildings and roads, and the heat made by human activities lead to higher urban(城市的) temperatures. So Beijing is deeply affected by “urban heat island(UHI城市热岛效应)”
When the winter holiday comes, most workers leave big cities for their own hometowns. As a result, the UHI effects are not that serious in large cities, but increase in tourists’ destinations(目的地) The research shows that the average(平均的) world temperature rose by 0.85 degrees Celsius between 1880 and 2012. Although this increase is not very obvious, many things have changed with the increase. The sea level has risen. Snow and ice cover has reduced(减少) and had climate(气候) events have become more common. “The CNY holiday offers a unique opportunity(机会) to study the effect.” Zhang Jingyong, lead scientist of the research, said, “Our research strengthens the role of population movements in urban climate, and may help deal with urban environmental problems.”
Lightening the colors of roofs, changing to white roofs, or planting more trees can help to lessen(减轻) UHI effects. Light-colored roofs reflect more solar radiation(日光照射) and reduce energy demand in warm seasons. Trees and grass have cooling effects by biological interaction(互相作用). Low-carbon production and lifestyle play an important role in reducing heat emissions(热量排放) from city buildings, factories, and cars, and thus become another effective means to lessen the heating effects.