The areas of largest ozone hole are Antarctica, South America, Australia, New Zealand. The main destroyers are CFC and halons which are used in refrigerators and air conditioners. Scientists estimate that one atom of chlorine can destroy 100 000 ozone molecules. If the destruction of environment continues the life on this planet will be endangered. I recent years a lot of environmental organizations have been found, e.g. Greenpeace, they develop their activities mainly in rich countries, they try to warn people by means of a lot of compaings, many of their suggestions were successful, e.g. using DDT was banned by law, or catalytic converters and unleaded petrol. All over the world there are air acts, water pollution acts and endangered species acts, each country has ministry for environment too.