自然灾害与人为灾害
哪个危害更大
自然灾害是人类依赖的自然界中所发生的异常现象，主要有地震、火山爆发、泥石流、海啸、台风、洪水等突发性灾害；也有地面沉降、土地沙漠化、干旱、海岸线变化等在较长时间中才能逐渐显现的渐变性灾害。人为灾害指由人为因素引发的灾害，主要包括自然资源衰竭灾害、环境污染灾害、火灾、交通灾害、人口过剩灾害及核灾害等。
四川汶山大地震造成数十万人员伤亡，在这场灾难中，有些人失去了生命，有些人失去了家园，而国家的经济损失也是相当之大的。苏联切尔诺贝利核事故造成当地成为数百年的不毛之地，所以说无论是自然灾害还是人为灾害，都有可能造成巨大的破坏与损失。
当然，不同的人有不同的想法。为了避免灾难的发生，我们要提高预测灾难可靠性的同时也要提高我们的责任心，我们要从科学的意义上认识灾害的发生、发展以及尽可能减小它们所造成的危害，这才是我们避免灾害的根本。
Which is more dangerous
Natural disasters are anomalies that occur in the nature of human. There are earthquakes, volcanic eruptions, tsunamis, typhoons, flood and other unexpected disasters; the disasters also include ground subsidence, land desertification, drought，changing coastline and so on. Man-made disasters means disasters caused by human factors, including the exhaustion of natural resources, disasters, environmental pollution disasters, fire, traffic accident, overpopulation disaster and nuclear disasters. Which is more dangerous between natural disasters and man-made disasters?
There are hundreds of thousands casualties in the earthquake of Sichuan, some people lost their lives, some people lost their homes, national financial lost is grievous; Historically, the 1986 chernobyl nuclear accident is defined as the most serious level 7, many people lost their lives in the man-made disaster. Summing up the appeal, in my opinion, not only natural disasters but also man-made disasters are all dangerous, they cause enormous damage and loss.
Of course, different people have different attitude. In order to avoid disaster, firstly, we should improve the reliability of forecasting disaster; secondly, we should improve the people's sense of responsibility. This is what we should do to avoid disaster.