It means to protect the environment. Pollution, cutting down trees, misusing resources, etc has an adverse impact on the environment. In turn we suffer due to it. Things
… like Tsunami, global warming, diseases are an outcome of it. One of the major environmental issues today is the growing concern over water shortage. Fresh water levels in many parts of the world have dropped alarmingly. We all know how important water is for sustenance of life. Thus, the need to save water has gained in importance. Check out the link given below to see what all we can do to conserve water at home and work. Similarly, we need to make sure that we do not waste our natural resources, plant tress, reduce landfills etc. Hope this helps. (MORE) 
