Biology Grade 12 

27.1 Renewable and Non-Renwable Resources 27.1.1 Renewable Resources

27.2 Degradation and Deplition of Resources 27.2.1 Modification of Environment

27.3 Man,s Impact On Environment 27.3.1 Population, Food and Need of Population Control

27.4 Deforestation and Afforestation 27.4.1 Importance of Forests

27.5 Pollution 27.5.1 Air or Atmospheric Pollution 27.5.2 Greenhouse Effect 27.5.3 Acid Rain 27.5.4 Water Pollution 27.5.5 Eutrophication or Algal Bloom 27.5.6 Industrial Effluents 27.5.7 Insecticides and Herbicides and Fertilizers