with the development of economy,people's living standard has improved a lot .but some environmental problems has exposed,thishas lead to many natural disasters such as forestfire ��air pollution and soon��it is necessary for us to take some measures to prevent it��first is to protect environment ��save electricity and water��after all the natural resources are limited .meanwhile��we need to stop deforest ��actually we all know what should do and not.it's urgent for us to act now to protect our common home ���ִ� �����ף���ְɣ�����׷��лл�ٰ��ҷ���һƪ�����ٷ֣��ֻ���ô׷�����õ��ֻ���֪���������ʰɣ�����������������