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The reason we need to save or conserve an ecosystem is because they are all interdependent, if one ecosystem is thrown off balance it causes a domino affect down the food chain/web.e thus need to save the ecosystem that supports us inorder to save ourselves from the damage we did to the environment that gives us our food, clothing and shelter. As Walter Kelly said in the Comic Strip Pogo,  We have met the enemy and he is US ! . Source(s):
Importance of air. 1. Essential supplier of energy: All living beings including plants & animals are dependent on air oxygen for generation of valuable life energy. Body cells take up oxygen from blood and generate energy from food in the form of ATP. This biochemical generation of ATP is a basic requirement to sustain life on earth.