Today, land, water and air have become polluted. Garbage is dumped in open spaces. Large factories emit a lot of smoke. Due to dust particles in the smoke, air becomes contaminated. In addition to the spread of foul odour, germs also breed in rotting trash leading to various diseases. Mosquitoes, flies and mice find a fertile breeding ground in mounds of waste. Garbage, from the households and the industrial wastes, fall into the rivers. This makes the water of the rivers polluted. Thus, increasing garbage in the home, outside or in water sources has aggravated the problem of air pollution.  olden times, garbage generally comprised only organic waste which went into the ground. In switzland garbage is been reused by genrating energy