Until the industrial revolution, the purity of the single atmosphere was altered by natural causes, such as for example the volcanic eruptions, but currently, the activity of man is to the atmosphere as a huge volcano not to introduce new substances in the air, making not only pollution but other dangerous evils as the rain.
Also, there is a big difference between gas eruptions and the chimneys and exhaust pipes. The latter release substances often strange, which react between if and natural atmospheric components, causing this, serious disturbances.
The massive introduction of pollutants alter the composition of the atmosphere and seriously damages human health , climate stability, and development of ecosystems, causing damage to the planet that are much more than a generation or a hundred years.
