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<p>Cars which emit no greenhouse gases or create no pollution...<br />Cell phones and laptops working for a long time with a single cartridge without the necessity of recharging...<br />The sun, the wind or the water from the river used for heating and lighting even at night or when there is no wind and the river is dry...<br />Using energy from the sun, the wind, the rivers or nuclear reactors to run car engines...</p><p>Is it possible?</p><p>In other words, can we use energy in a way that it can be stored, be renewable, respects the environment and does no harm to health?</p><p>- what is energy?<br />- why do we need it?<br />- where does it come from?<br />- what are the consequences of its use?</p>