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When we talk about our environment we mean everything in the world around us which can affect our lives. When we talk about the environment we mean everything in the world around us that surrounds and affects all life on earth, including the air, food chains, the water cycle, plants, animals and other humans. Five basic needs of human beings from the environment are oxygen, water, food, shelter and warmth. We get these from the planet on which we live. 1  We breathe oxygen from the air.  We get water from the rain which fills our lakes, rivers and creeks and which we store in dams, reservoirs and water tanks.
The concept of an ecosystem is important because it conveys one of the key insights that we have gained from the science of ecology, that everything is related to everything else.Everyday perception tells us that we live in a world composed of distinct units: trees, rocks, animals, buildings, and so on.or example: they provide foods, medicines and energy; they regulate nutrient recycling and waste; they lock up carbon; they maintain clean air and water, they supply crop pollination, seed dispersal, pest and disease control; they preserve genetic diversity and provide recreation for us all.