By the year 2000 the great majority of the world's growing population will be living in towns or cities. A new wave of industrialisation must follow to improve standards of living and provide jobs for the milli 2. Industry uses power, iron ore, aluminium, plastics from oil, stone, wood, gold, silver, diamonds. The resources will run out faster. Global warming happens when the carbon dioxide we breathe out, also released by burning fuels, rises in the atmosphere, trapping the heat of the sun.
Carbon dioxide rises as oxygen falls.
Plants and trees breathe in carbon dioxide and when in sunlight they use it to build fibre or wood, releasing precious oxygen back into the atmosphere. Trees are cut down for fuel in some countries, Africa for example. Without fuel, you cannot boil water or cook meals. Trees are also cut down for building materials. In South America, trees are cut down to grow food.