Energy-basis of car,modern appliances,... is bening ran out more and more.Peoplle nowasdays don't think too much about the energy,they think when they pay money,they can use it forever.But they wrong,and energy also make the air pollution increase.For example,every year,humans use about 14 x 10^16 kWh,and most of them a coal,oil-about 90 percent,which are making the earth more dirty.You are thinking about nuclear ?No,it's not a good choice because it's so dangerous and can't still for long time.Hmmm,Water energy???It's make the weather in the country change and the water we use make energy is clear water,not water from sea,,and clear water are only 1% in the earth right now.For the surmount,energy from Sun,Wind is the most effective to help the earth.So from now,you can help the earth by using less dirty energy and using more clear energy .

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