Some day nature will certainly react to us because human being pay no attention to protecting environment. Maybe some kind of disaster will strike us. When such terrible thing happens, we should learn to protect ourselves. When we are indoors, we mustn't get clost to electricity .We mustn't use cellphones. When we are outdoors, we should stay at a safe place far away from tall trees. Finally we should keep calm because only in this way can we find better ways to protect ourselves.