Shortly after the Gulf War, researchers reported on this area. During the war, when normal oil production slowed down, the area suffered from hundreds of thick smoke, heavy oil fires and wanton oil crossflow. However, after the war, the oil pollution in this area was lighter than the results of their investigation in this area before the war. They also reported that compared with the levels of polycyclic aromatic hydrocarbons (abbreviated as PAHs) recorded in the baltic oil-producing region with mild climate, the concentration of compounds in this region is relatively low. PAHs used to produce combustible products were ejected from oil wells during the war. Which of the following discussion can best explain the above materials. ['Oil pollution has a greater impact on the environment in temperate regions than in desert regions.', 'Oil pollution and PAHs pollution dissipate faster in temperate regions than in desert regions.', 'Oil pollution and PAHs pollution dissipate faster in desert areas than in mild climates.', 'In peacetime, oil production and transportation in the Gulf led to high levels of PAHs and large-scale oil dumping.']