Pollution
Pollution (environmental pollution), refers to the natural or man-made to the environment to add a substance and more than the environment's self-purification ability to harm the behavior. Mainly on the natural environment of the environment and human health hazards, even if it does not cause harm, but the follow-up effect is also harmful pollution, such as nitrogen oxides, although itself is not harmful, but in the sunlight and free radicals and other substances Will be converted into photochemical smog, causing harm to the creatures, causing corrosion to the building. Pollution has two sizes, regional pollution and global pollution. In the past, people's attention was only on regional pollution. Such as burning coal will produce smoke and sulfur dioxide, harmful to human respiratory health, reduce the attention of pollution mainly on how to remove smoke and deal with sulfur dioxide. But in recent decades, scientific research has found that pollution can cause global effects, such as burning coal will produce harm to human health will not cause harm to carbon dioxide, but a large number of carbon dioxide emissions will cause severe greenhouse effect, causing abnormal changes in global climate. ...