2 技术对环境的影响既明显又细微
The effects of technology on the environment are both obvious and subtle. The more obvious effects include the depletion of nonrenewable natural resources , and the added pollution of air, water, and land. The more subtle effects include debates over long-term effects .
Each wave of technology creates a set of waste previously unknown by humans: toxic waste, radioactive waste, electronic waste.
One of the main problems is the lack of an effective way to remove these pollutants on a large scale expediently. In nature, organisms recycle the wastes of other organisms, for example, plants produce oxygen as a by-product of photosynthesis, oxygen-breathing organisms use oxygen to metabolize food, producing carbon dioxide as a by-product, which plants use in a process to make sugar, with oxygen as a waste in the first place. No such mechanism exists for the removal of technological wastes.
Humanity at the moment may be compared to a colony of bacteria in a Petri dish with a constant food supply: with no way to remove the wastes of their metabolism, the bacteria eventually poison themselves.
以上内容是小编为大家分享的GRE作文备考资料,希望考生能认真阅读,对GRE作文备考有所帮助!希望大家能写出好作文!
【GRE作文资料:环保】相关文章:
最新
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01