We know that many human activities lead to increasing levels of pollution of the air, water-bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?

Isolating the activities to specific and limited areas would not help in reducing pollution. Air, water and soil are natural resources and are inter-related. Pollution of one usually leads to the pollution of the other resource. Moreover the pollution cannot be limited to a specific region or area. For example, if air becomes polluted by excessive amount of carbon dioxide, it will cause warming of the air over that land. As a resust air at region will rise this will cause air from nearby areas to move in place of rising a hot air. So, carbon dioxide will spread in the atmosphere affecting other areas too. Similarly increased level of oxides of nitrogen and sulphur in air of an area will diffuse in the atmosphere affecting other places. 

The pollution of water bodies of a specific area will cause depletion of oxygen and addition of poisonous substances. It will lead to death of aquatic animals and plants of the particular water-body and affect the related food chains or food webs will be disturbed not at particular area of the nearby areas too. Similarly, if the soil will loose fertility, there will be soil erosion. Thus isolating the activities to specific and limited areas wont help.