双边类大作文，环境类话题
Some people think that car-free days can help decrease air pollution, but others think there are other ways to achieve this. Discuss both views and give your own opinion.
题目来源：2017年1月12日大陆雅思大作文
题目大意：
一些人认为无车日可以减少环境污染，然而其他人认为有别的方式也可以减少环境污染。讨论双方观点并给出你的意见。
思路解析：
这是一道环境类考题，讨论的是无车日对于减少空气污染的作用，以及是否其他手段。双边讨论类的题目，可以自由讨论双方各自的利弊，你可以同意某一方观点也可以持中立（都同意或都反对）。审题时需要注意关键词decrease air pollution，文章要针对减少污染这个概念去分析。题目不算难，两方观点也不冲突，因此可以持中立态度，即两方都有道理，下面就和大家一起看下具体观点~
先来看无车日的作用。仅仅在一年中的某一天让大家不开私家车所能减少的尾气排放量是非常少的，从这一点来看无车日对于减少环境污染的作用是微不足道的。但是无车日作为一种公益宣传，可以提高人们的环保意识，让人们接受绿色出行的理念，减少私家车转而通过乘坐公共交通，进而减少尾气排放和空气污染。
然后来看其他减少空气污染的手段。
一是要求工厂和企业使用更先进的技术或净化废气后再排放，限制会造成污染的企业和工厂生产，进而减少工业废气所带来的空气污染。
二是发展清洁能源用以替代污染能源，煤炭、石油等能源在燃烧时会产生二氧化碳、二氧化硫等气体，这些气体会对空气造成污染，因此用清洁能源替代能够减少污染气体。
三是发展更加发达的公共交通，使得居民出行更为方便而不用依赖私家车，减少私家车的数量和使用频率，进而减少私家车所带来的空气污染。
提纲：
范文示例：
Nowadays, air pollution has become a thorny issue and several feasible measures have been proposed in an attempt to enhance the quality of air across borders. Although it is universally accepted that car-free days can be an effective solution, other methods seem to become more pragmatic.
On the one hand, when citizens are willing to resort to other means of transport instead of their private cars, the practice of car-free days seems to be fruitful. Due to less private vehicles on the road, the public transportation system can run more smoothly; therefore, there is, in all likelihood, a considerable decline in the amount of pollution-causing gas, meaning that the air quality may become cleaner. This situation might encourage individuals to reduce car usage on a regular basis to diminish air contamination to some extent.
Nevertheless, it is considered that more alternatives could be applied to minimize the number of air quality pollutants. The most immediate solution would be that all factories need to apply cutting-edge pollution-free technologies in production so that exhaust fumes from these factories would become more environmentally friendly. Another remedy might be the exploration and application of some renewable energy including nuclear power, solar energy and wind power. This kind of resource may contribute to fulfilling the increasing requirements for energy for industrial production and daily household consumption without causing serious damage to the air quality.
In conclusion, despite the certain benefits of car-free day as aforementioned, I still argue that various other methods seem to be more achievable to overcome air pollution problems and therefore improve our living standard.
相关词汇和语法结构：
thorny 棘手的
feasible 可行的
pragmatic 实际的
fruitful 富有成效的
contamination 污染
cutting-edge 先进的
exhaust fumes 废气
renewable energy 可再生能源
remedy 处理方法
