ответы 1) what is meant by ecological problems? 2) can you give examples of water, air and land disaster? 3) why is it necessary to compile efforts to cope with these disaster?

Ecological problem is a change in the natural environment, which leads to disruption of the structure and functioning of nature. The environmental problem is manifested in the change in the properties of natural resources, such as land, air, water. A huge number of cars in large cities leads to air pollution. Environmental scientists use special devices to measure the intensity of harmful gases in the air, and they show a significantly higher safe level. Water pollution by plants leads to the flowering of water, and this in turn leads to the extinction of the creatures, which there live. People eat fish caught in polluted water and poison their organisms. Often, various wastes, including radioactive, are buried in the ground. which violates its properties and leads to the infertility of the ground. Therefore, all the inhabitants of the earth must unite in order to save our resources. Otherwise, the time will come when there will be no clean fresh water, there will be no land for growing vegetables, we will not be able to breathe clean air.