【正确答案】Candidate A: This picture shows environmental protection is a global issue whose achievement must rely on the joined efforts of all the countries in the World. The usual case is once an environmental catastrophe happens, it will impact on not only the country itself but also other neighboring countries. Candidate B: Yes, a good example is the disasters of earthquake and tsunami recently hitting Japan, the radioactive substances have spread to some Asian Countries, which leads to the anxiety of the vast number of Japanese and Asian people. In this sense, environmental protection is a large scale global issue and there is no individual person or country can independently solve this problem. Candidate A: Good example. Environmental protection at the international level can also help to approach a higher achievement in easing the tension of global warming. If all countries act to follow the international laws about protecting environment by limiting the fuel emission to the air and stop large industries from dumping pollutants into air or water, people will confront with less challenging problems about pollution. Candidate B: Moreover, it is widely believed that when the powerful countries make efforts to protect environment, other countries will follow suit and break down the national boundaries to take part in these activities. Candidate A: So we can safely draw the conclusion that environmental pollutions are affecting not only individual but also entire countries all over the world. In response to this, cooperations between different countries are strongly advised, which will help to take a tremendous step to environment protection and bequeath a better world for descendants.