On earth hour Nowadays,It is commonly believed that" Greenhouse effect "has become an seriously problem.therefore,"On earth hour"this programe has been came up with in the world,and hope citizens to turn off the light one hour.but people think quite differently on this question. Some people agree with this programe,they think it is very useful for us to protect our earth,but others think it is just a "show". Personaly speaking,I vote for keep this "On earth hour" going on,we must recognize that our earth has become more and more warm,we must do something to stop it,from what we get,we can make a living.what we give,however,makes a life,so it is the advantage far outweighs the disadvantage.