Atmospheric pollution
作者：John Brennan
1. CFC gases
1.1. Damage Ozone layer
2. Fossil fuels
2.1. Coal
2.2. Oil
2.2.1. Carbon Particles
2.3. Gas
2.4. Power stations
2.4.1. CO2
2.4.1.1. Greenhouse effect
2.4.2. SO2
2.4.2.1. Acid Rain
2.5. Cars
2.5.1. NOX
2.5.1.1. Causes smog
2.5.1.2. Causes Asthma.