5.  POLLUTION OF ENERGY INDUSTRIES

1. Air pollution.
2. Ozone layer destruction.
3. Acid rain.
4. Greenhouse effect.

===============

The texts used in this unit section have been taken from the following websites:

 http://healthandenergy.com/air_pollution_causes.htm

http://www.epcc.pref.osaka.jp/apec/eng/earth/ozone_layer_depletion/susumu.html

http://www.ypte.org.uk/docs/factsheets/env_facts/acid_rain.html

http://environment.about.com/od/globalwarming/a/greenhouse.htm