How is the eco-system menaced?

pollution, killing of living organisms
exhaustion of earth's resources
urbanisation
deforestation and soil erosion - destruction of fertile land, destruction of species of plants and animals
insecticides
pesticides and fertilizers - eutrophication
nuclear wastes
domestic wastes
industrial wastes
ozone layer, CFCs
acid rain, sulphur dioxide and nitrogen oxides
greenhouse effect, global warming - carbon dioxide and methane

possible solutions:
control of population, moderate and controlled building of industries, recycling waste material, substituting materials for DDT and CFC, mining the sea bed and other planets (in the distant future), combined heat and power schemes, government and international action, pollution tax