我们的家园──地球，她的表面覆盖着与我们人类生活息息相关的森林。由于森林火灾。滥砍滥伐、酸雨和沙漠侵蚀，全球森林正在以年损失１８００～２０００万公顷的速度消失，世界气候恶化，旱涝等灾害严重威胁着人类，每年有５亿人口受洪水危害，１．５亿人日遭受饥饿死亡的威 Our homeland - Earth, is covered in a forest that is closely connected with our human life. Due to forest fire. Deforestation, acid rain and desert erosion have caused global forests to disappear at an annual rate of 18 to 20 million hectares. The world’s climate is deteriorating. Disasters such as droughts and floods pose serious threats to human beings. Each year, 500 million people are endangered by floods and 1.5 Hundreds of millions of people suffer the starvation of death