1. Ironically the most serious threat to air, water and the ecosystem stems from the way energy is produced and used.
A. These sources have harmful effects on earth's climate or they pollute air and water, destroy the fragile ecosystem, endanger human health and above all change the climate condition by altering the weather cycles.
B. A major part of energy comes from burning fossil fuels like coal, oil, natural gas and now a days atomic energy is produced by using uranium, and other radio active elements.
C. The challenge before scientists and environmentalists is to find ways and means to minimize the threat posed by these elements.
D. Radioactive elements are the most harmful as they cause irreparable damage to both environment and humans.
6. It is not just them, it is the duty of all individuals to become the trustees to the cause of caring for earth.
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